Hi! I would need help related to nand boot with am335x based board. Board boots from mmc (sd card), but not from nand flash. I have been using yocto/poky build system with meta-ti layer that brings up u-boot-ti-staging. Current u-boot version is 2016.05 and linux-ti-staging-rt-4.4.
I have used am335x_evm config (include/configs/am335x_evm.h) that I have made minor modifications to suit it to my board. Most of the modifications are made to board/ti/am335x/board.c and mux.c to adapt to different memories and pin mappings and lack of card id eeprom.
This story is "follow up" to http://lists.denx.de/pipermail/u-boot/2017-January/277168.html. So, I2C was initialized somehow when booting from mmc, but not when booting from nand.
"Follow up" part: Board did still not start booting kernel even though I2C init problem was fixed.
The reason was that boot_targets variable has been assigned with mmc0 legacy_mmc0 mmc1 legacy_mmc1 nand0 pxe dhcp when main u-boot is brought up. These values are iterated when distro_bootcmd is executed. distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done I made minor modification to distro_bootcmd: distro_bootcmd=for target in ${boot_targets}; do echo "======= ${target} =======" ; run bootcmd_${target}; done Please find the distro_bootcmd running results below: => run distro_bootcmd ======= mmc0 ======= Card did not respond to voltage select! ======= legacy_mmc0 ======= Card did not respond to voltage select! Card did not respond to voltage select! ======= mmc1 ======= data abort pc : [<8ff70fa0>] lr : [<8ff701e9>] reloc pc : [<8081dfa0>] lr : [<8081d1e9>] sp : 8ef286f0 ip : 8ff5891d fp : 00000003 r10: 8ffb3b18 r9 : 8ef32ed8 r8 : 8ef41b10 r7 : 8ff584bd r6 : 8ef39478 r5 : 8ef39500 r4 : 47810000 r3 : 8ff70f91 r2 : 00014892 r1 : 00000000 r0 : 8ef39500 Flags: nZCv IRQs off FIQs on Mode SVC_32 Resetting CPU ...
So, MMC1 was troublemaker this time. I removed mmc1 from that command - I do not have mmc1 on my board. => setenv boot_targets ' mmc0 legacy_mmc0 nand0 '
Please find modified command results below: => run distro_bootcmd ======= mmc0 ======= Card did not respond to voltage select! ======= legacy_mmc0 ======= Card did not respond to voltage select! Card did not respond to voltage select! ======= nand0 ======= ## Error: "bootcmd_nand0" not defined
NOTE!! Is this a bug in u-boot-ti? There is no bootcmd_nand0 in u-boot memory at this time. However, there is bootcmd_nand. So, I changed nand0 to nand => setenv boot_targets ' mmc0 legacy_mmc0 nand' => run distro_bootcmd ======= mmc0 ======= Card did not respond to voltage select! ======= legacy_mmc0 ======= Card did not respond to voltage select! Card did not respond to voltage select! ======= nand ======= Booting from nand ...
NAND read: device 0 offset 0x80000, size 0x40000 262144 bytes read: OK
NAND read: device 0 offset 0x200000, size 0x800000 8388608 bytes read: OK Kernel image @ 0x82000000 [ 0x000000 - 0x2c4fd8 ] ## Flattened Device Tree blob at 88000000 Booting using the fdt blob at 0x88000000 Loading Device Tree to 8ef1b000, end 8ef27614 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Initializing cgroup subsys cpu
....... lots of listing and then ...... [ 1.172458] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda [ 1.179257] nand: Micron MT29F2G08ABAEAWP [ 1.183469] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64 [ 1.191491] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme [ 1.197164] 10 ofpart partitions found on MTD device 8000000.nand [ 1.203607] Creating 10 MTD partitions on "8000000.nand": [ 1.209285] 0x000000000000-0x000000020000 : "NAND.SPL" [ 1.216261] 0x000000020000-0x000000040000 : "NAND.SPL.backup1" [ 1.223834] 0x000000040000-0x000000060000 : "NAND.SPL.backup2" [ 1.231275] 0x000000060000-0x000000080000 : "NAND.SPL.backup3" [ 1.238794] 0x000000080000-0x0000000c0000 : "NAND.u-boot-spl-os" [ 1.246571] 0x0000000c0000-0x0000001c0000 : "NAND.u-boot" [ 1.254316] 0x0000001c0000-0x0000001e0000 : "NAND.u-boot-env" [ 1.261612] 0x0000001e0000-0x000000200000 : "NAND.u-boot-env.backup1" [ 1.269653] 0x000000200000-0x000000a00000 : "NAND.kernel" [ 1.283112] 0x000000a00000-0x000010000000 : "NAND.file-system" [ 1.520856] tps65217 0-0024: TPS65217 ID 0xe version 1.2 [ 1.526486] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz [ 1.533461] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 400 kHz [ 1.539830] ubi0: attaching mtd9 [ 1.543810] ubi0 error: validate_ec_hdr: bad VID header offset 512, expected 2048 [ 1.551672] ubi0 error: validate_ec_hdr: bad EC header [ 1.557063] Erase counter header dump: [ 1.560998] magic 0x55424923 [ 1.564930] version 1 [ 1.568041] ec 1 [ 1.571151] vid_hdr_offset 512 [ 1.574444] data_offset 2048 [ 1.577831] image_seq 1630296601 [ 1.581762] hdr_crc 0x988c84d [ 1.585600] erase counter header hexdump: [ 1.589844] CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.39-rt49-g9d47072444 #2 [ 1.597427] Hardware name: Generic AM33XX (Flattened Device Tree) [ 1.603824] Backtrace: [ 1.606422] [<c0013380>] (dump_backtrace) from [<c001357c>] (show_stack+0x18/0x1c) [ 1.614370] r7:00000000 r6:00000001 r5:cf027000 r4:cf419000 [ 1.620337] [<c0013564>] (show_stack) from [<c0295998>] (dump_stack+0x24/0x28) [ 1.627937] [<c0295974>] (dump_stack) from [<c03c1e24>] (validate_ec_hdr+0xc0/0x12c) [ 1.636077] [<c03c1d64>] (validate_ec_hdr) from [<c03c2a6c>] (ubi_io_read_ec_hdr+0x168/0x218) [ 1.645047] r7:cf027000 r6:55424923 r5:cf419000 r4:00000000 [ 1.651012] [<c03c2904>] (ubi_io_read_ec_hdr) from [<c03c75d0>] (ubi_attach+0x164/0x14b8) [ 1.659607] r10:cf3e3c80 r9:c07d5b1c r8:00000000 r7:cf027000 r6:00000000 r5:cf027000 [ 1.667854] r4:00000000 [ 1.670519] [<c03c746c>] (ubi_attach) from [<c03bc768>] (ubi_attach_mtd_dev+0x6d0/0xc50) [ 1.679011] r10:00000800 r9:00000840 r8:cf3d8400 r7:cf027000 r6:00000000 r5:cf3d8400 [ 1.687256] r4:fffff800 [ 1.689923] [<c03bc098>] (ubi_attach_mtd_dev) from [<c0743300>] (ubi_init+0x1c8/0x250) [ 1.698240] r10:0000006e r9:c079d600 r8:00000000 r7:c0756734 r6:c0756738 r5:cf3d8400 [ 1.706487] r4:00000000 [ 1.709153] [<c0743138>] (ubi_init) from [<c00096a4>] (do_one_initcall+0x98/0x1e0) [ 1.717099] r8:00000000 r7:cf3e6a80 r6:c07623a0 r5:c0743138 r4:c07623a0 [ 1.724169] [<c000960c>] (do_one_initcall) from [<c0722e84>] (kernel_init_freeable+0x138/0x1dc) [ 1.733301] r8:c07225ec r7:c0751838 r6:c0751834 r5:c079d600 r4:00000007 [ 1.740386] [<c0722d4c>] (kernel_init_freeable) from [<c053948c>] (kernel_init+0x10/0xf0) [ 1.748973] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c053947c [ 1.757220] r4:00000000 [ 1.759887] [<c053947c>] (kernel_init) from [<c000f980>] (ret_from_fork+0x14/0x34) [ 1.767835] r5:c053947c r4:00000000 [ 1.771596] ubi0 error: ubi_io_read_ec_hdr: validation failed for PEB 0 [ 1.778549] ubi0 error: ubi_attach_mtd_dev: failed to attach mtd9, error -22 [ 1.785991] UBI error: cannot attach mtd9 [ 1.790295] hctosys: unable to open rtc device (rtc0) [ 1.801005] UBIFS error (pid: 1): cannot open "ubi0:rootfs", error -19VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0): error -19 [ 1.814905] Please append a correct "root=" boot option; here are the available partitions: [ 1.823726] 1f00 128 mtdblock0 (driver?) [ 1.829039] 1f01 128 mtdblock1 (driver?) [ 1.834351] 1f02 128 mtdblock2 (driver?) [ 1.839661] 1f03 128 mtdblock3 (driver?) [ 1.844974] 1f04 256 mtdblock4 (driver?) [ 1.850282] 1f05 1024 mtdblock5 (driver?) [ 1.855606] 1f06 128 mtdblock6 (driver?) [ 1.860915] 1f07 128 mtdblock7 (driver?) [ 1.866245] 1f08 8192 mtdblock8 (driver?) [ 1.871553] 1f09 251904 mtdblock9 (driver?) [ 1.876884] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
Now I'm terrified!! This reminds me for years back when I tried to boot from 3.x kernel written ubifs partition from u-boot. I never managed in that. I could touch ubifs filesystem from Linux or u-boot, but if I did so from Linux, I could not touch it from u-boot anymore and vice versa. Later on it worked with newer u-boot.
Procedure I did now from SD card booted linux 4.4 for writing rootfs to mtdblock9 is listed below: ------------------------------------------------- flash_erase /dev/mtd9 0 0 > /dev/null ubiformat /dev/mtd9 > /dev/null
ubiattach -p /dev/mtd9 > /dev/null ubimkvol -N rootfs -m /dev/ubi0 > /dev/null mkdir -p /mnt/flash mount -t ubifs ubi0:rootfs /mnt/flash > /dev/null
tar -C /mnt/flash -xf rootfs.tgz > /dev/null sync umount /mnt/flash > /dev/null ubidetach -p /dev/mtd9 > /dev/null ------------------------------------------------- Did I do anything wrong in creating that? It is quite accessible from Linux. Do anyone know how to fix this problem? Have nand boot been tested with am335x_evm board? I'm somewhat worried about that as there was that nand0 device in boot_targets...
Thanks, Matti