External Flash lose files



  • @robert-hh Yes, I have seen core dumps with previous versions of LFS. That is why I moved to FAT again. But I need the improved file system life.



  • @robert-hh adding 500ms delays before and during the file close sequence made no improvement.

    It appears to fail at the second close.

    The first file is only open for reading.
    The second file has been open for writing.

    There is a distinct possibility that the second file was closed at an earlier stage in the process before this close is called. But this should not cause a crash.

    Any ideas.



  • @tuftec I started on Saturday another long term test running (writing million of times a single file). The test is now at ~800_000 writes. During that test, I see regular core dumps. Not at fixed intervals. I'm on it to find a reason. Alternatively I could go back to LFS2.03 with wear leveling enabled.
    So you have seen the same error with the previous LFS? Then going back might not solve the problem.

    P.S.: I used to prefer FAT because it is more reliable in normal operations. However crashes during files writes have a high chance of total file system corruption.



  • @robert-hh unfortunately the LFS 2.3 build you created does not work for me.
    It dumps core when trying to close 2 x open JSON files, as does the previous LFS build that I tried.

    It appears to fail between the first and second file close.
    You made a comment about LFS being slower. Is there a chance that maybe the second close interferes with the first (that has not completed)????

    I am going to have to ultimately run LFS to get the flash life that I need.

    Any clues further ideas.

    I will try to add some delays to see what happens.



  • @robert-hh Thanks. I will give it a try.



  • @tuftec it's here: https://github.com/robert-hh/Shared-Stuff.git
    Changes to the recent Dev version:

    • use lfs 2.3 with block level wear-leveling enabled
    • support UART inverted mode
    • enforce guard time for the RGB LED
    • some minor tweaks, which may not apply for FiPy

    In addition, the frozen modules contain the upysh module (see: https://github.com/micropython/micropython-lib/tree/master/upysh) and the onboard editor pye (see: https://github.com/robert-hh/Micropython-Editor)

    Edit: LFS2.3 clears all files. So save them beforehand.



  • No Pybytes and FiPy.
    Thanks



  • @tuftec For which board. And do you needPyBytes support?



  • Hi Guys, Thanks for that. Some really good insight.
    I do not have experience in re-building Pycom.
    Has anyone built a very recent version 1.20.2.r3 or later that has the enhanced lfs in it. Last time I tried to use lfs, it didn't work very well for me.

    Peter.



  • @robert-hh

    Ok, Tks Robert, I will try that.

    Best Regards,



  • @serafimsaudade @Lourenço-Frade Going through the various versions of lfs, it might be worth to update to the actual version 2.3. Pycom uses 2.0.3, as it seems. There were some bug fixes between 2.0.3 and 2.3, even in the wear leveling mechanism. The upgrade is easy: just replace the lfs.* and lfsutil.* files. The firmware build properly. In one case test the old file system was not readable any more. So that may have to checked more deeply.



  • @Lourenço-Frade Sorry, I hardly know anything about the mechanisms and implementation of lfs. But the in their repository is a SPEC.md document with a lot of explanations. See: https://github.com/littlefs-project/littlefs.git

    But I made at least two tests:

    1. I have set the block_cycle value to 100 and did ~2000 single file writes (create a file "logfile", write 2k, close it). So the number of files is constant. Then I looked at the number of free blocks before and after the test. This number did not change. So the block wear leveling for the superblocks does no affect the free space.
    2. I repeated that test with debug messages enable on block erase and block prog. Each file write causes two erase/prog calls. The first to a block with an increasing number, which is for the data. And the second to an alternating pair of block numbers. These are the superblocks with directory entries. Every 100 calls, one member of this pair changes. That's what was expected because block cycle was set to 100. But then there was also a erase/prog pair to blocks 0 and 1, alternating every 100 file writes. So it looks like a single step indirection, in that
    • blocks 0 and 1 are still used, but 'block_cycle' times more rarely.
    • blocks 0 and 1 point to the 'active' superblocks, which are changes after having been used 'block_cycle' time. These blocks are then considered as free for reuse. And being used e.g. only 1000 times, this creates no additional risk.

    Given these observations, a good value for block_cycle would be about the number of blocks in the file system. For WiPy3 that is 1024. So 1000 is a good value. And the wear out number for blocks 0 and 1 would be increased by a factor of 1000.
    In your case of writing every minute that would be a guaranteed time of 190 years. That should be long enough.

    Edit: Below is a small section of the logfile for test 2.

    --Erase 746  ++Prog 746  --Erase 646  ++Prog 646
    --Erase 747  ++Prog 747  --Erase 544  ++Prog 544
    --Erase 748  ++Prog 748  --Erase 646  ++Prog 646
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    --Erase 1012  ++Prog 1012  --Erase 856  ++Prog 856
    --Erase 1013  ++Prog 1013  --Erase 958  ++Prog 958
    --Erase 1014  ++Prog 1014  --Erase 856  ++Prog 856
    --Erase 1015  ++Prog 1015  --Erase 958  ++Prog 958
    --Erase 1016  ++Prog 1016  --Erase 856  ++Prog 856
    --Erase 1017  ++Prog 1017  --Erase 958  ++Prog 958
    --Erase 1018  ++Prog 1018  --Erase 856  ++Prog 856
    --Erase 1019  ++Prog 1019  --Erase 958  ++Prog 958
    --Erase 1020  ++Prog 1020  --Erase 856  ++Prog 856
    --Erase 1021  ++Prog 1021  --Erase 958  ++Prog 958
    --Erase 1022  ++Prog 1022  --Erase 856  ++Prog 856
    --Erase 1023  ++Prog 1023  --Erase 958  ++Prog 958
    --Erase 2  ++Prog 2  --Erase 856  ++Prog 856
    --Erase 3  ++Prog 3  --Erase 958  ++Prog 958
    --Erase 4  ++Prog 4  --Erase 856  ++Prog 856
    --Erase 5  ++Prog 5  --Erase 958  ++Prog 958
    --Erase 6  ++Prog 6  --Erase 856  ++Prog 856
    --Erase 7  ++Prog 7  --Erase 958  ++Prog 958
    --Erase 8  ++Prog 8  --Erase 856  ++Prog 856
    --Erase 9  ++Prog 9  --Erase 958  ++Prog 958
    --Erase 10  ++Prog 10  --Erase 856  ++Prog 856
    --Erase 11  ++Prog 11  --Erase 958  ++Prog 958
    --Erase 12  ++Prog 12  --Erase 856  ++Prog 856
    --Erase 13  ++Prog 13  --Erase 958  ++Prog 958
    --Erase 14  ++Prog 14  --Erase 856  ++Prog 856
    --Erase 15  ++Prog 15  --Erase 958  ++Prog 958
    --Erase 16  ++Prog 16  --Erase 856  ++Prog 856
    --Erase 17  ++Prog 17  --Erase 958  ++Prog 958
    --Erase 18  ++Prog 18  --Erase 856  ++Prog 856
    --Erase 19  ++Prog 19  --Erase 958  ++Prog 958
    --Erase 20  ++Prog 20  --Erase 856  ++Prog 856
    --Erase 21  ++Prog 21  --Erase 958  ++Prog 958
    --Erase 22  ++Prog 22  --Erase 856  ++Prog 856
    --Erase 23  ++Prog 23  --Erase 958  ++Prog 958
    --Erase 24  ++Prog 24  --Erase 856  ++Prog 856
    --Erase 25  ++Prog 25  --Erase 958  ++Prog 958
    --Erase 26  ++Prog 26  --Erase 856  ++Prog 856
    --Erase 27  ++Prog 27  --Erase 958  ++Prog 958
    --Erase 28  ++Prog 28  --Erase 856  ++Prog 856
    --Erase 29  ++Prog 29  --Erase 958  ++Prog 958
    --Erase 30  ++Prog 30  --Erase 856  ++Prog 856
    --Erase 31  ++Prog 31  --Erase 958  ++Prog 958
    --Erase 32  ++Prog 32  --Erase 856  ++Prog 856
    --Erase 33  ++Prog 33  --Erase 958  ++Prog 958
    --Erase 34  ++Prog 34  --Erase 856  ++Prog 856
    --Erase 35  ++Prog 35  --Erase 958  ++Prog 958
    --Erase 36  ++Prog 36  --Erase 856  ++Prog 856
    --Erase 37  ++Prog 37  --Erase 958  ++Prog 958
    --Erase 38  ++Prog 38  --Erase 39  ++Prog 39  --Erase 1  ++Prog 1
    --Erase 40  ++Prog 40  --Erase 958  ++Prog 958
    --Erase 41  ++Prog 41  --Erase 39  ++Prog 39
    --Erase 42  ++Prog 42  --Erase 958  ++Prog 958
    --Erase 43  ++Prog 43  --Erase 39  ++Prog 39
    --Erase 44  ++Prog 44  --Erase 958  ++Prog 958
    --Erase 45  ++Prog 45  --Erase 39  ++Prog 39
    --Erase 46  ++Prog 46  --Erase 958  ++Prog 958
    --Erase 47  ++Prog 47  --Erase 39  ++Prog 39
    --Erase 48  ++Prog 48  --Erase 958  ++Prog 958
    --Erase 49  ++Prog 49  --Erase 39  ++Prog 39
    --Erase 50  ++Prog 50  --Erase 958  ++Prog 958
    --Erase 51  ++Prog 51  --Erase 39  ++Prog 39
    --Erase 52  ++Prog 52  --Erase 958  ++Prog 958
    --Erase 53  ++Prog 53  --Erase 39  ++Prog 39
    --Erase 54  ++Prog 54  --Erase 958  ++Prog 958
    --Erase 55  ++Prog 55  --Erase 39  ++Prog 39
    --Erase 56  ++Prog 56  --Erase 958  ++Prog 958
    --Erase 57  ++Prog 57  --Erase 39  ++Prog 39
    --Erase 58  ++Prog 58  --Erase 958  ++Prog 958
    --Erase 59  ++Prog 59  --Erase 39  ++Prog 39
    --Erase 60  ++Prog 60  --Erase 958  ++Prog 958
    --Erase 61  ++Prog 61  --Erase 39  ++Prog 39
    --Erase 62  ++Prog 62  --Erase 958  ++Prog 958
    --Erase 63  ++Prog 63  --Erase 39  ++Prog 39
    --Erase 64  ++Prog 64  --Erase 958  ++Prog 958
    --Erase 65  ++Prog 65  --Erase 39  ++Prog 39
    --Erase 66  ++Prog 66  --Erase 958  ++Prog 958
    --Erase 67  ++Prog 67  --Erase 39  ++Prog 39
    --Erase 68  ++Prog 68  --Erase 958  ++Prog 958
    --Erase 69  ++Prog 69  --Erase 39  ++Prog 39
    --Erase 70  ++Prog 70  --Erase 958  ++Prog 958
    --Erase 71  ++Prog 71  --Erase 39  ++Prog 39
    --Erase 72  ++Prog 72  --Erase 958  ++Prog 958
    --Erase 73  ++Prog 73  --Erase 39  ++Prog 39
    --Erase 74  ++Prog 74  --Erase 958  ++Prog 958
    --Erase 75  ++Prog 75  --Erase 39  ++Prog 39
    --Erase 76  ++Prog 76  --Erase 958  ++Prog 958
    --Erase 77  ++Prog 77  --Erase 39  ++Prog 39
    --Erase 78  ++Prog 78  --Erase 958  ++Prog 958
    --Erase 79  ++Prog 79  --Erase 39  ++Prog 39
    --Erase 80  ++Prog 80  --Erase 958  ++Prog 958
    --Erase 81  ++Prog 81  --Erase 39  ++Prog 39
    --Erase 82  ++Prog 82  --Erase 958  ++Prog 958
    --Erase 83  ++Prog 83  --Erase 39  ++Prog 39
    --Erase 84  ++Prog 84  --Erase 958  ++Prog 958
    --Erase 85  ++Prog 85  --Erase 39  ++Prog 39
    --Erase 86  ++Prog 86  --Erase 958  ++Prog 958
    --Erase 87  ++Prog 87  --Erase 39  ++Prog 39
    --Erase 88  ++Prog 88  --Erase 958  ++Prog 958
    --Erase 89  ++Prog 89  --Erase 39  ++Prog 39
    --Erase 90  ++Prog 90  --Erase 958  ++Prog 958
    --Erase 91  ++Prog 91  --Erase 39  ++Prog 39
    --Erase 92  ++Prog 92  --Erase 958  ++Prog 958
    --Erase 93  ++Prog 93  --Erase 39  ++Prog 39
    --Erase 94  ++Prog 94  --Erase 958  ++Prog 958
    --Erase 95  ++Prog 95  --Erase 39  ++Prog 39
    --Erase 96  ++Prog 96  --Erase 958  ++Prog 958
    --Erase 97  ++Prog 97  --Erase 39  ++Prog 39
    --Erase 98  ++Prog 98  --Erase 958  ++Prog 958
    --Erase 99  ++Prog 99  --Erase 39  ++Prog 39
    --Erase 100  ++Prog 100  --Erase 958  ++Prog 958
    --Erase 101  ++Prog 101  --Erase 39  ++Prog 39
    --Erase 102  ++Prog 102  --Erase 958  ++Prog 958
    --Erase 103  ++Prog 103  --Erase 39  ++Prog 39
    --Erase 104  ++Prog 104  --Erase 958  ++Prog 958
    --Erase 105  ++Prog 105  --Erase 39  ++Prog 39
    --Erase 106  ++Prog 106  --Erase 958  ++Prog 958
    --Erase 107  ++Prog 107  --Erase 39  ++Prog 39
    --Erase 108  ++Prog 108  --Erase 958  ++Prog 958
    --Erase 109  ++Prog 109  --Erase 39  ++Prog 39
    --Erase 110  ++Prog 110  --Erase 958  ++Prog 958
    --Erase 111  ++Prog 111  --Erase 39  ++Prog 39
    --Erase 112  ++Prog 112  --Erase 958  ++Prog 958
    --Erase 113  ++Prog 113  --Erase 39  ++Prog 39
    --Erase 114  ++Prog 114  --Erase 958  ++Prog 958
    --Erase 115  ++Prog 115  --Erase 39  ++Prog 39
    --Erase 116  ++Prog 116  --Erase 958  ++Prog 958
    --Erase 117  ++Prog 117  --Erase 39  ++Prog 39
    --Erase 118  ++Prog 118  --Erase 958  ++Prog 958
    --Erase 119  ++Prog 119  --Erase 39  ++Prog 39
    --Erase 120  ++Prog 120  --Erase 958  ++Prog 958
    --Erase 121  ++Prog 121  --Erase 39  ++Prog 39
    --Erase 122  ++Prog 122  --Erase 958  ++Prog 958
    --Erase 123  ++Prog 123  --Erase 39  ++Prog 39
    --Erase 124  ++Prog 124  --Erase 958  ++Prog 958
    --Erase 125  ++Prog 125  --Erase 39  ++Prog 39
    --Erase 126  ++Prog 126  --Erase 958  ++Prog 958
    --Erase 127  ++Prog 127  --Erase 39  ++Prog 39
    --Erase 128  ++Prog 128  --Erase 958  ++Prog 958
    --Erase 129  ++Prog 129  --Erase 39  ++Prog 39
    --Erase 130  ++Prog 130  --Erase 958  ++Prog 958
    --Erase 131  ++Prog 131  --Erase 39  ++Prog 39
    --Erase 132  ++Prog 132  --Erase 958  ++Prog 958
    --Erase 133  ++Prog 133  --Erase 39  ++Prog 39
    --Erase 134  ++Prog 134  --Erase 958  ++Prog 958
    --Erase 135  ++Prog 135  --Erase 39  ++Prog 39
    --Erase 136  ++Prog 136  --Erase 958  ++Prog 958
    --Erase 137  ++Prog 137  --Erase 39  ++Prog 39
    --Erase 138  ++Prog 138  --Erase 958  ++Prog 958
    --Erase 139  ++Prog 139  --Erase 39  ++Prog 39
    --Erase 140  ++Prog 140  --Erase 141  ++Prog 141  --Erase 0  ++Prog 0
    --Erase 142  ++Prog 142  --Erase 39  ++Prog 39
    --Erase 143  ++Prog 143  --Erase 141  ++Prog 141
    --Erase 144  ++Prog 144  --Erase 39  ++Prog 39
    --Erase 145  ++Prog 145  --Erase 141  ++Prog 141
    --Erase 146  ++Prog 146  --Erase 39  ++Prog 39
    --Erase 147  ++Prog 147  --Erase 141  ++Prog 141
    --Erase 148  ++Prog 148  --Erase 39  ++Prog 39
    --Erase 149  ++Prog 149  --Erase 141  ++Prog 141
    --Erase 150  ++Prog 150  --Erase 39  ++Prog 39
    --Erase 151  ++Prog 151  --Erase 141  ++Prog 141
    --Erase 152  ++Prog 152  --Erase 39  ++Prog 39
    --Erase 153  ++Prog 153  --Erase 141  ++Prog 141
    --Erase 154  ++Prog 154  --Erase 39  ++Prog 39
    --Erase 155  ++Prog 155  --Erase 141  ++Prog 141
    --Erase 156  ++Prog 156  --Erase 39  ++Prog 39
    --Erase 157  ++Prog 157  --Erase 141  ++Prog 141
    --Erase 158  ++Prog 158  --Erase 39  ++Prog 39
    --Erase 159  ++Prog 159  --Erase 141  ++Prog 141
    --Erase 160  ++Prog 160  --Erase 39  ++Prog 39
    --Erase 161  ++Prog 161  --Erase 141  ++Prog 141
    --Erase 162  ++Prog 162  --Erase 39  ++Prog 39
    --Erase 163  ++Prog 163  --Erase 141  ++Prog 141
    --Erase 164  ++Prog 164  --Erase 39  ++Prog 39
    --Erase 165  ++Prog 165  --Erase 141  ++Prog 141
    --Erase 166  ++Prog 166  --Erase 39  ++Prog 39
    --Erase 167  ++Prog 167  --Erase 141  ++Prog 141
    --Erase 168  ++Prog 168  --Erase 39  ++Prog 39
    --Erase 169  ++Prog 169  --Erase 141  ++Prog 141
    --Erase 170  ++Prog 170  --Erase 39  ++Prog 39
    --Erase 171  ++Prog 171  --Erase 141  ++Prog 141
    --Erase 172  ++Prog 172  --Erase 39  ++Prog 39
    --Erase 173  ++Prog 173  --Erase 141  ++Prog 141
    --Erase 174  ++Prog 174  --Erase 39  ++Prog 39
    --Erase 175  ++Prog 175  --Erase 141  ++Prog 141
    --Erase 176  ++Prog 176  --Erase 39  ++Prog 39
    --Erase 177  ++Prog 177  --Erase 141  ++Prog 141
    --Erase 178  ++Prog 178  --Erase 39  ++Prog 39
    --Erase 179  ++Prog 179  --Erase 141  ++Prog 141
    --Erase 180  ++Prog 180  --Erase 39  ++Prog 39
    --Erase 181  ++Prog 181  --Erase 141  ++Prog 141
    --Erase 182  ++Prog 182  --Erase 39  ++Prog 39
    --Erase 183  ++Prog 183  --Erase 141  ++Prog 141
    --Erase 184  ++Prog 184  --Erase 39  ++Prog 39
    --Erase 185  ++Prog 185  --Erase 141  ++Prog 141
    --Erase 186  ++Prog 186  --Erase 39  ++Prog 39
    --Erase 187  ++Prog 187  --Erase 141  ++Prog 141
    --Erase 188  ++Prog 188  --Erase 39  ++Prog 39
    --Erase 189  ++Prog 189  --Erase 141  ++Prog 141
    --Erase 190  ++Prog 190  --Erase 39  ++Prog 39
    --Erase 191  ++Prog 191  --Erase 141  ++Prog 141
    --Erase 192  ++Prog 192  --Erase 39  ++Prog 39
    --Erase 193  ++Prog 193  --Erase 141  ++Prog 141
    --Erase 194  ++Prog 194  --Erase 39  ++Prog 39
    --Erase 195  ++Prog 195  --Erase 141  ++Prog 141
    --Erase 196  ++Prog 196  --Erase 39  ++Prog 39
    --Erase 197  ++Prog 197  --Erase 141  ++Prog 141
    --Erase 198  ++Prog 198  --Erase 39  ++Prog 39
    --Erase 199  ++Prog 199  --Erase 141  ++Prog 141
    --Erase 200  ++Prog 200  --Erase 39  ++Prog 39
    --Erase 201  ++Prog 201  --Erase 141  ++Prog 141
    --Erase 202  ++Prog 202  --Erase 39  ++Prog 39
    --Erase 203  ++Prog 203  --Erase 141  ++Prog 141
    --Erase 204  ++Prog 204  --Erase 39  ++Prog 39
    --Erase 205  ++Prog 205  --Erase 141  ++Prog 141
    --Erase 206  ++Prog 206  --Erase 39  ++Prog 39
    --Erase 207  ++Prog 207  --Erase 141  ++Prog 141
    --Erase 208  ++Prog 208  --Erase 39  ++Prog 39
    --Erase 209  ++Prog 209  --Erase 141  ++Prog 141
    --Erase 210  ++Prog 210  --Erase 39  ++Prog 39
    --Erase 211  ++Prog 211  --Erase 141  ++Prog 141
    --Erase 212  ++Prog 212  --Erase 39  ++Prog 39
    --Erase 213  ++Prog 213  --Erase 141  ++Prog 141
    --Erase 214  ++Prog 214  --Erase 39  ++Prog 39
    --Erase 215  ++Prog 215  --Erase 141  ++Prog 141
    --Erase 216  ++Prog 216  --Erase 39  ++Prog 39
    --Erase 217  ++Prog 217  --Erase 141  ++Prog 141
    --Erase 218  ++Prog 218  --Erase 39  ++Prog 39
    --Erase 219  ++Prog 219  --Erase 141  ++Prog 141
    --Erase 220  ++Prog 220  --Erase 39  ++Prog 39
    --Erase 221  ++Prog 221  --Erase 141  ++Prog 141
    --Erase 222  ++Prog 222  --Erase 39  ++Prog 39
    --Erase 223  ++Prog 223  --Erase 141  ++Prog 141
    --Erase 224  ++Prog 224  --Erase 39  ++Prog 39
    --Erase 225  ++Prog 225  --Erase 141  ++Prog 141
    --Erase 226  ++Prog 226  --Erase 39  ++Prog 39
    --Erase 227  ++Prog 227  --Erase 141  ++Prog 141
    --Erase 228  ++Prog 228  --Erase 39  ++Prog 39
    --Erase 229  ++Prog 229  --Erase 141  ++Prog 141
    --Erase 230  ++Prog 230  --Erase 39  ++Prog 39
    --Erase 231  ++Prog 231  --Erase 141  ++Prog 141
    --Erase 232  ++Prog 232  --Erase 39  ++Prog 39
    --Erase 233  ++Prog 233  --Erase 141  ++Prog 141
    --Erase 234  ++Prog 234  --Erase 39  ++Prog 39
    --Erase 235  ++Prog 235  --Erase 141  ++Prog 141
    --Erase 236  ++Prog 236  --Erase 39  ++Prog 39
    --Erase 237  ++Prog 237  --Erase 141  ++Prog 141
    --Erase 238  ++Prog 238  --Erase 39  ++Prog 39
    --Erase 239  ++Prog 239  --Erase 141  ++Prog 141
    --Erase 240  ++Prog 240  --Erase 39  ++Prog 39
    --Erase 241  ++Prog 241  --Erase 141  ++Prog 141
    --Erase 242  ++Prog 242  --Erase 243  ++Prog 243  --Erase 1  ++Prog 1
    --Erase 244  ++Prog 244  --Erase 141  ++Prog 141
    --Erase 245  ++Prog 245  --Erase 243  ++Prog 243
    --Erase 246  ++Prog 246  --Erase 141  ++Prog 141
    --Erase 247  ++Prog 247  --Erase 243  ++Prog 243
    --Erase 248  ++Prog 248  --Erase 141  ++Prog 141
    --Erase 249  ++Prog 249  --Erase 243  ++Prog 243
    --Erase 250  ++Prog 250  --Erase 141  ++Prog 141
    --Erase 251  ++Prog 251  --Erase 243  ++Prog 243
    --Erase 252  ++Prog 252  --Erase 141  ++Prog 141
    --Erase 253  ++Prog 253  --Erase 243  ++Prog 243
    --Erase 254  ++Prog 254  --Erase 141  ++Prog 141
    --Erase 255  ++Prog 255  --Erase 243  ++Prog 243
    --Erase 256  ++Prog 256  --Erase 141  ++Prog 141
    --Erase 257  ++Prog 257  --Erase 243  ++Prog 243
    --Erase 258  ++Prog 258  --Erase 141  ++Prog 141
    --Erase 259  ++Prog 259  --Erase 243  ++Prog 243
    --Erase 260  ++Prog 260  --Erase 141  ++Prog 141
    --Erase 261  ++Prog 261  --Erase 243  ++Prog 243
    --Erase 262  ++Prog 262  --Erase 141  ++Prog 141
    --Erase 263  ++Prog 263  --Erase 243  ++Prog 243
    --Erase 264  ++Prog 264  --Erase 141  ++Prog 141
    --Erase 265  ++Prog 265  --Erase 243  ++Prog 243
    --Erase 266  ++Prog 266  --Erase 141  ++Prog 141
    --Erase 267  ++Prog 267  --Erase 243  ++Prog 243
    --Erase 268  ++Prog 268  --Erase 141  ++Prog 141
    --Erase 269  ++Prog 269  --Erase 243  ++Prog 243
    --Erase 270  ++Prog 270  --Erase 141  ++Prog 141
    --Erase 271  ++Prog 271  --Erase 243  ++Prog 243
    --Erase 272  ++Prog 272  --Erase 141  ++Prog 141
    --Erase 273  ++Prog 273  --Erase 243  ++Prog 243
    --Erase 274  ++Prog 274  --Erase 141  ++Prog 141
    --Erase 275  ++Prog 275  --Erase 243  ++Prog 243
    --Erase 276  ++Prog 276  --Erase 141  ++Prog 141
    --Erase 277  ++Prog 277  --Erase 243  ++Prog 243
    --Erase 278  ++Prog 278  --Erase 141  ++Prog 141
    --Erase 279  ++Prog 279  --Erase 243  ++Prog 243
    --Erase 280  ++Prog 280  --Erase 141  ++Prog 141
    --Erase 281  ++Prog 281  --Erase 243  ++Prog 243
    --Erase 282  ++Prog 282  --Erase 141  ++Prog 141
    --Erase 283  ++Prog 283  --Erase 243  ++Prog 243
    --Erase 284  ++Prog 284  --Erase 141  ++Prog 141
    --Erase 285  ++Prog 285  --Erase 243  ++Prog 243
    --Erase 286  ++Prog 286  --Erase 141  ++Prog 141
    --Erase 287  ++Prog 287  --Erase 243  ++Prog 243
    --Erase 288  ++Prog 288  --Erase 141  ++Prog 141
    --Erase 289  ++Prog 289  --Erase 243  ++Prog 243
    --Erase 290  ++Prog 290  --Erase 141  ++Prog 141
    --Erase 291  ++Prog 291  --Erase 243  ++Prog 243
    --Erase 292  ++Prog 292  --Erase 141  ++Prog 141
    --Erase 293  ++Prog 293  --Erase 243  ++Prog 243
    --Erase 294  ++Prog 294  --Erase 141  ++Prog 141
    --Erase 295  ++Prog 295  --Erase 243  ++Prog 243
    --Erase 296  ++Prog 296  --Erase 141  ++Prog 141
    --Erase 297  ++Prog 297  --Erase 243  ++Prog 243
    --Erase 298  ++Prog 298  --Erase 141  ++Prog 141
    --Erase 299  ++Prog 299  --Erase 243  ++Prog 243
    --Erase 300  ++Prog 300  --Erase 141  ++Prog 141
    --Erase 301  ++Prog 301  --Erase 243  ++Prog 243
    --Erase 302  ++Prog 302  --Erase 141  ++Prog 141
    --Erase 303  ++Prog 303  --Erase 243  ++Prog 243
    --Erase 304  ++Prog 304  --Erase 141  ++Prog 141
    --Erase 305  ++Prog 305  --Erase 243  ++Prog 243
    --Erase 306  ++Prog 306  --Erase 141  ++Prog 141
    --Erase 307  ++Prog 307  --Erase 243  ++Prog 243
    --Erase 308  ++Prog 308  --Erase 141  ++Prog 141
    --Erase 309  ++Prog 309  --Erase 243  ++Prog 243
    --Erase 310  ++Prog 310  --Erase 141  ++Prog 141
    --Erase 311  ++Prog 311  --Erase 243  ++Prog 243
    --Erase 312  ++Prog 312  --Erase 141  ++Prog 141
    --Erase 313  ++Prog 313  --Erase 243  ++Prog 243
    --Erase 314  ++Prog 314  --Erase 141  ++Prog 141
    --Erase 315  ++Prog 315  --Erase 243  ++Prog 243
    --Erase 316  ++Prog 316  --Erase 141  ++Prog 141
    --Erase 317  ++Prog 317  --Erase 243  ++Prog 243
    --Erase 318  ++Prog 318  --Erase 141  ++Prog 141
    --Erase 319  ++Prog 319  --Erase 243  ++Prog 243
    --Erase 320  ++Prog 320  --Erase 141  ++Prog 141
    --Erase 321  ++Prog 321  --Erase 243  ++Prog 243
    --Erase 322  ++Prog 322  --Erase 141  ++Prog 141
    --Erase 323  ++Prog 323  --Erase 243  ++Prog 243
    --Erase 324  ++Prog 324  --Erase 141  ++Prog 141
    --Erase 325  ++Prog 325  --Erase 243  ++Prog 243
    --Erase 326  ++Prog 326  --Erase 141  ++Prog 141
    --Erase 327  ++Prog 327  --Erase 243  ++Prog 243
    --Erase 328  ++Prog 328  --Erase 141  ++Prog 141
    --Erase 329  ++Prog 329  --Erase 243  ++Prog 243
    --Erase 330  ++Prog 330  --Erase 141  ++Prog 141
    --Erase 331  ++Prog 331  --Erase 243  ++Prog 243
    --Erase 332  ++Prog 332  --Erase 141  ++Prog 141
    --Erase 333  ++Prog 333  --Erase 243  ++Prog 243
    --Erase 334  ++Prog 334  --Erase 141  ++Prog 141
    --Erase 335  ++Prog 335  --Erase 243  ++Prog 243
    --Erase 336  ++Prog 336  --Erase 141  ++Prog 141
    --Erase 337  ++Prog 337  --Erase 243  ++Prog 243
    --Erase 338  ++Prog 338  --Erase 141  ++Prog 141
    --Erase 339  ++Prog 339  --Erase 243  ++Prog 243
    --Erase 340  ++Prog 340  --Erase 141  ++Prog 141
    --Erase 341  ++Prog 341  --Erase 243  ++Prog 243
    --Erase 342  ++Prog 342  --Erase 141  ++Prog 141
    --Erase 343  ++Prog 343  --Erase 243  ++Prog 243
    --Erase 344  ++Prog 344  --Erase 345  ++Prog 345  --Erase 0  ++Prog 0
    --Erase 346  ++Prog 346  --Erase 243  ++Prog 243
    --Erase 347  ++Prog 347  --Erase 345  ++Prog 345
    --Erase 348  ++Prog 348  --Erase 243  ++Prog 243
    
    


  • @robert-hh Hello again Robert.
    Hello again, Robert.
    Reading the code on lfs.c, where the block cycle is instanced, I was searching for a implementation of something akin to a circular buffer, that being, when the block cycle of the last superblock ends, the buffer pointer resetting to the first user superblock. I was hoping to see that implemented on the relocate jump, but I found no hint of that there, as well. I might be wrong in my assumption, but such a low block-cycle as you suggested, considering our requisites, would lead to a complete halt of flash writing in just a period of months.
    Could you have a look at that? There might be something that I've not seen properly.



  • @serafimsaudade I did some more testing. It is no problem to set the value of block_cycles to a moderate number like 1000. No additional space is consumed and the speed is not affected. The LFS document recommends a value of 100 - 1000. Micropython.org uses 100. I made my test with 100, to see changes in short test time.



  • @robert-hh

    Shifting the file system seems to make it.
    I got one wipy3 up and running. :)
    I will start testing the rest.

    Best Regards,



  • @Lourenço-Frade Hello. I just suggested the same, of shifting the file system 4 blocks up. As far as I understand, this is just the file system which will be moved, as it is in the upper area of the flash. With my suggested change, the size is also accordingly reduced. So it should not affect any other objects in flash.



  • @serafimsaudade said in External Flash lose files:

    Do you think with this change the wipy3 that have flash wearout will be reusable?

    If the problem was flash wearout, then this single change will most likely not bring the broken device to live again, because block 0 and 1 are defective. One possibility I see is to shift the file system a little bit up in memory. If that applies to bloc 0 and 1, four block should be sufficient. For that, you could to modify esp32/fatfs/src/drivers/sflash_diskio.h, lines 24 to 28 as follows:

    #define SFLASH_FS_SHIFT                 4
    #define SFLASH_BLOCK_COUNT_8MB          MICROPY_PORT_SFLASH_BLOCK_COUNT_8MB - SFLASH_FS_SHIFT
    #define SFLASH_FS_SECTOR_COUNT_8MB      ((SFLASH_BLOCK_SIZE * SFLASH_BLOCK_COUNT_8MB) / SFLASH_FS_SECTOR_SIZE)
    #define SFLASH_START_ADDR_8MB           (0x00400000 + SFLASH_BLOCK_SIZE * SFLASH_FS_SHIFT)
    #define SFLASH_START_BLOCK_8MB          (SFLASH_START_ADDR_8MB / SFLASH_BLOCK_SIZE)
    #define SFLASH_END_BLOCK_8MB            (SFLASH_START_BLOCK_8MB + (SFLASH_BLOCK_COUNT - 1)) - SFLASH_FS_SHIFT
    

    Edit: The symbol SFLASH_BLOCK_COUNT is not defined at all. But since SFLASH_END_BLOCK_8MB and SFLASH_END_BLOCK_4MB are not used at all, it's not a problem. I guess, the line should be:

    #define SFLASH_END_BLOCK_8MB            (SFLASH_START_BLOCK_8MB + (SFLASH_BLOCK_COUNT_8MB - 1))```


  • Greetings Robert. I'm working with @serafimsaudade in this issue, and we believe there may be a way to reuse the flash if we change the starting address of the starting address (sflash_diskio.h, line 26) by 128kbytes (essentially, avoiding the first two super block addresses, and initiating the block cycle from superblock 2). The problem is we are uncertain whether this would shift ALL the flash, including the flash RAM the firmware partition, or if the address defined is just relative to the volatile memory.



  • @robert-hh said in External Flash lose files:

    @serafimsaudade So it looks like the option of block level wearout protection works for V1 too. I tested it with a setting of 100. But I imageine that this setting eats up superblocks (and space) permanently. So a level of 10000 could be more appropriate.

    Edit: The file & line to be changed: littlefs/sflash_diskio_littlefs.c, line 48

    Edit2: Looking in to the code, the actual LFS version used by pycom is 2.0, not 1.x as I assumed earler. The other version tried is 2.3. So not much difference then. It was just the non-enabled block-wear protection.

    Tks @robert-hh
    I will compile an new fw with the change.
    Do you think with this change the wipy3 that have flash wearout will be reusable?

    Best Regards,



  • @tuftec NVRAM is also flash based, but is told to implement protection against flash wear.


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