Hello Everyone! I'm not sure, if I used, the correct mailing list, but I hope that's the right one. Because it's related to filesystem. I would like to get running the pstore feature for iMX8 CPU with kernel 5.10.9 . Basically I followed the 3 variants of documentation. - the official one: https://www.kernel.org/doc/html/latest/admin-guide/pstore-blk.html - the android one: http://huaqianlee.github.io/2020/11/13/Android/pstore/ - the complex one: https://github.com/gmpy/articles/blob/master/pstore/Test-Pstore-Block.md but ... nothing have been working . I will summarize the steps what I did: 1. created an empty device (fdisk) without any partition format (~1GB), mmcblk0p4 2. modified the DTB, to reserve some memory: > reserved-memory { > #address-cells = <2>; > #size-cells = <2>; > ranges; > > /* global autoconfigured region for contiguous allocations */ > linux,cma { > compatible = "shared-dma-pool"; > reusable; > size = <0 0x3c000000>; > alloc-ranges = <0 0x96000000 0 0x3c000000>; > linux,cma-default; > }; > > ramoops: ramoops@ffc00000 { > compatible = "removed-dma-pool", "ramoops"; > no-map; > reg = <0 0xffc00000 0 0x00100000>; > record-size = <0x1000>; > console-size = <0x40000>; > ftrace-size = <0x0>; > msg-size = <0x20000 0x20000>; > cc-size = <0x0>; > }; >}; 3. enabled feature via defconfig (see .config feature): >CONFIG_PSTORE=y ># CONFIG_PSTORE_DEFLATE_COMPRESS is not set ># CONFIG_PSTORE_LZO_COMPRESS is not set ># CONFIG_PSTORE_LZ4_COMPRESS is not set ># CONFIG_PSTORE_LZ4HC_COMPRESS is not set ># CONFIG_PSTORE_842_COMPRESS is not set ># CONFIG_PSTORE_ZSTD_COMPRESS is not set >CONFIG_PSTORE_CONSOLE=y >CONFIG_PSTORE_PMSG=y >CONFIG_PSTORE_FTRACE=y >CONFIG_PSTORE_RAM=y >CONFIG_PSTORE_ZONE=m >CONFIG_PSTORE_BLK=m >CONFIG_PSTORE_BLK_BLKDEV="" >CONFIG_PSTORE_BLK_KMSG_SIZE=64 >CONFIG_PSTORE_BLK_MAX_REASON=2 >CONFIG_PSTORE_BLK_PMSG_SIZE=64 >CONFIG_PSTORE_BLK_CONSOLE_SIZE=64 >CONFIG_PSTORE_BLK_FTRACE_SIZE=64 >... >CONFIG_DEBUG_FS=y >CONFIG_DEBUG_FS_ALLOW_ALL=y ># CONFIG_DEBUG_FS_DISALLOW_MOUNT is not set ># CONFIG_DEBUG_FS_ALLOW_NONE is not set >CONFIG_HAVE_ARCH_KGDB=y >CONFIG_DEBUG_KERNEL=y >CONFIG_DEBUG_MISC=y > ># CONFIG_DEBUG_SHIRQ is not set > ># ># Debug Oops, Lockups and Hangs ># >CONFIG_PANIC_ON_OOPS=y >CONFIG_PANIC_ON_OOPS_VALUE=1 >CONFIG_PANIC_TIMEOUT=20 >CONFIG_LOCKUP_DETECTOR=y >CONFIG_SOFTLOCKUP_DETECTOR=y >CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC=y >CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=1 >CONFIG_DETECT_HUNG_TASK=y >CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120 >CONFIG_BOOTPARAM_HUNG_TASK_PANIC=y >CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=1 >CONFIG_WQ_WATCHDOG=y ># CONFIG_TEST_LOCKUP is not set ># end of Debug Oops, Lockups and Hangs 4. modprobe pstore_blk blkdev=/dev/mmcblk0p4 - lsmod showed, that pstore_blk + pstore_zone modules have been loaded - nothing has been written into dmesg\ 5. ls /sys/fs/pstore was empty, even if it was mounted 6. echo 1 > /sys/kernel/debug/pstore/record_ftrace - /sys/kernel/debug/ - mounted - /sys/kernel/debug/pstore - path doesn't exist (which is little bit strange to me) 7. echo c > /proc/sysrq-trigger - system was rebooted, but nothing has been written somewhere 8. changed to built-in option, without module using - CONFIG_PSTORE_BLK_BLKDEV="b304" - still the same results ... So what I'm trying to get is, when some core module crash..., I would like to have the dump. I think, that I don't need the ramoops, it was just an example to get something working. - How to reproduce the things from documentation? - Is it possible to get it working not only for custom modules? - What I'm doing wrong? Many thanks for any advice, Andrej
