Estou tentando fazer com que meu Criador CI20 seja inicialize a partir do sdcard diretamente.
Eu compilei um kernel Linux vanilla 4.9.20 usando (estou executando o debian stretch no meu laptop):
$ make ARCH=mips ci20_defconfig
$ make ARCH=mips CROSS_COMPILE=mipsel-linux-gnu- uImage
Image Name: Linux-4.9.20
Created: Sat Jul 1 21:04:19 2017
Image Type: MIPS Linux Kernel Image (uncompressed)
Data Size: 5225712 Bytes = 5103.23 kB = 4.98 MB
Load Address: 80010000
Entry Point: 8034d0a0
Image arch/mips/boot/uImage is ready
Se eu copiar o arquivo arch/mips/boot/uImage para o meu local do tftp , posso gerenciar o kernel para inicializar corretamente:
Hit any key to stop autoboot: 0
ci20# dhcp 0x88000000 192.168.0.14:uImage
ERROR: resetting DM9000 -> not responding
dm9000 i/o: 0xb6000000, id: 0x90000a46
DM9000: running in 8 bit mode
MAC: d0:31:10:ff:7d:02
operating at 100M full duplex mode
BOOTP broadcast 1
DHCP client bound to address 192.168.0.15
Using dm9000 device
TFTP from server 192.168.0.14; our IP address is 192.168.0.15
Filename 'uImage'.
Load address: 0x88000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
################################
264.6 KiB/s
done
Bytes transferred = 4924012 (4b226c hex)
## Booting kernel from Legacy Image at 88000000 ...
Image Name: Linux-4.9.20
Image Type: MIPS Linux Kernel Image (uncompressed)
Data Size: 4923948 Bytes = 4.7 MiB
Load Address: 80010000
Entry Point: 803465e0
Verifying Checksum ... OK
Loading Kernel Image ... OK
Starting k[ 0.111767] jz4780-nemc 13410000.nemc: failed to calculate clock period
[ 0.148419] UBI error: cannot open mtd 3, error -19[ 0.153621] UBI error: cannot open mtd 4, error -19
[ 0.158775] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 0.167039] Rebooting in 10 seconds..bootm 0x88000000NAND: 8192 MiB
Mas se eu copiá-lo para o meu cartão SD, eu recebo esta mensagem estranha de u-boot:
U-Boot 2013.10-rc3-g25f5638f9 (Jul 01 2017 - 16:30:50)
Board: ci20 (r1) (Ingenic XBurst JZ4780 SoC)
DRAM: 1 GiB
NAND: 8192 MiB
MMC: jz_mmc msc1: 0
In: eserial4
Out: eserial4
Err: eserial4
Net: dm9000
Hit any key to stop autoboot: 0
** File not found /boot/uImage **
Wrong Image Format for bootm command
ERROR: can't get kernel image!
Aqui está o conteúdo do sdcard:
% tree /media/mathieu/466bcc7d-37c4-41f3-b83f-8ac6628eb2bb/boot
/media/mathieu/466bcc7d-37c4-41f3-b83f-8ac6628eb2bb/boot
├── uImage
└── vmlinux.img
0 directories, 2 files
E o sistema de arquivos é:
% mount
/dev/mmcblk0p1 on /media/mathieu/466bcc7d-37c4-41f3-b83f-8ac6628eb2bb type ext4 (rw,nosuid,nodev,relatime,data=ordered,uhelper=udisks2)
Existe uma maneira de obter um pouco mais de informações sobre o que o erro poderia ser?
Como explicado por @ tom-rini, o problema era simplesmente o 64bits no ext4 adicionado automaticamente.
A documentação de:
Descreve:
$ sudo mkfs.ext4 /dev/sdx1
em vez disso, deveria ter dito (para o mais novo comando mkfs.ext4):
$ sudo mkfs.ext4 -O^64bit,^metadata_csum /dev/sdx1
Apenas para a posteridade, esta é a segunda vez que sou mordido por isso:
Espero que o último.