Sunday, 2021-03-28

« Saturday, 2021-03-27 Index Monday, 2021-03-29 »
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rfriedalex88: Yes.00:42
rfriedalex88: u-boot-fw-utils00:43
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marexrfried: better yet, libubootenv01:50
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alex88thank you! I'll look into that02:13
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kergothfrosteyes: https://github.com/MentorEmbedded/meta-mentor/blob/master/meta-mel-support/classes/image-sanity-incompatible.bbclass may be of use to you, if you set INCOMPATIBLE_LICENSE globally to a value that allows gplv3 to be built, but set it differently in the image, and use this class, it'll error out if someone tried to install a gplv3 package into the image, but would allow it to build as usual03:21
kergothfrosteyes: we had a case where we whitelisted something to let it build, but never wanted it to be installed in a production image, only a development one, and this made sure that was the case for us03:22
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frosteyesThanks kergoth it looks very much what I need07:13
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chryshalex88: to create ipk's, there is the command bitbake -c do_package_write_ipk <image>, but that's all hacky. I recommend the life coding sessions with LetoThe2nd to get an idea of the yocto workflow :) : https://www.youtube.com/watch?v=ThTl4FItfMI&list=PLD4M5FoHz-TxMfBFrDKfIS_GLY25Qsfyj07:36
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vitaliHi, I'm looking to install ext sdk generated by yocto under WSL2 but getting a :/mnt/c/Program: bad variable name from post-relocate-setup.sh, not so critical for regular sdk since it doesnt prevent actual sdk from functioning, but for sdk_ext it blocks it completely15:43
vitaliIs anybody aware of a workaround? I understand that it's a clash of windows/linux folder naming and WSL2 is not supported, but maybe somebody already encountered this issue?15:43
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frosteyesHi folks. Has anyone worked with squashfs, and had issue with performance?18:25
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frosteyesI have some qspi nor flash (in theory it would be able to do 150 MB/s) and if I use dd directly on the /dev/mtd device it perform around 114 MB/s. So pretty good18:27
frosteyesI have then created a mtd partition of 110 MB and created a squashfs using xz with block size of 1M. written it to flash and mounted it..18:28
frosteyes(it only contains a single file currently). When I try to read this file with dd, it only gives around 6.2 MB/s.18:28
frosteyesKnows that the decompression takes some overhead, but 6.2 MB/s is much slower than I would expect.18:28
frosteyesSo any input is welcome :D18:29
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goliathDoes a bigger dd blocksize help? Maybe trying another SquashFS compressor?19:18
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frosteyesI have added kprobe tracing with echo 'p squashfs_read_data super_block=%x0 index=%x1 length=%x2' > kprobe_events19:30
frosteyesIt gives the following result.19:31
frosteyes              dd-2141  [001] d...  9134.666453: p_squashfs_read_data_0: (squashfs_read_data+0x0/0x5c8 [squashfs]) super_block=0xffffffc9737eb000 index=0x60 length=0x48c7419:31
frosteyes              dd-2141  [002] d...  9134.821142: p_squashfs_read_data_0: (squashfs_read_data+0x0/0x5c8 [squashfs]) super_block=0xffffffc9737eb000 index=0x48cd4 length=0x4b83019:31
frosteyes              dd-2141  [001] d...  9134.988574: p_squashfs_read_data_0: (squashfs_read_data+0x0/0x5c8 [squashfs]) super_block=0xffffffc9737eb000 index=0x94504 length=0x4ae4c19:31
frosteyesSo length fluctuate and does not seems to fit with block - on this level..19:33
frosteyesWill just see if I can find the place where the data from the mtd is requested.. So I can see what size is requested..19:34
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frosteyesUsing kprobe I noticed that all mtd_read was 0x200 bytes (512)20:13
frosteyesThis is the mtdblock device, where I can see that .blksize is set to 512 in mtdblock.c20:13
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goliathMakes sense so far. 1M block size means mksquashfs chops the input up into 1M blocks that it then compresses to variable sized output blocks. And of course you need a block device wrapper underneath, because SquashFS cannot talk to UBI or MTD.20:30
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frosteyesgoliath: I was not prepared on the slow mtdblock, and I can't change blocksize..21:47
frosteyes~ # dd if=/dev/mtd3 of=/dev/null bs=128k count=1021:47
frosteyes1310720 bytes (1.3MB) copied, 0.011095 seconds, 112.7MB/s21:47
frosteyes~ # dd if=/dev/mtdblock3 of=/dev/null bs=128k count=1021:47
frosteyes1310720 bytes (1.3MB) copied, 0.362195 seconds, 3.5MB/s21:47
frosteyesSo will need another way in using the mtdblock.21:48
frosteyesWill use the kernel mailing list, but just a quick question. Do you know if UBI is able to work with locked flash, or does UBI require to be able to write to the flash.21:49
frosteyesThe reason I ask, is for this part, it is production data so is readonly, and I will prefer to be able to lock the flash in production after the data is written. Notice it is nor flash.21:50
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