Wandboard external root (SATA or USB)?

[krovetz]

Does anybody know how to setup a wandboard to have its root be on the external drive?

[WarheadsSE]

Assuming you have a USB or SATA (Quad only!), then you need the sd card for the bootloader & config, but just changing it to have root=/dev/sda1 (or appropriate) should be enough.

[krovetz]

Where does the config go? It's really nice when that can be done via a boot.scr or uEnv.txt, but I can't find anything like that. Does this machine require a serial connection and manual manipulation of u-boot variables?
Thanks.

[kmihelich]

You would need serial at the moment.. I'll update U-Boot to make using an environment easier. Give me a few hours.

[kmihelich]

Do an -Syu and you will pull in the new uboot version (2013.07-2). Be sure to say 'y' to flash it to the card. You can then create and set up a /boot/uEnv.txt file like any other platform.

Here is the default U-Boot environment for reference:
$this->bbcode_second_pass_code('', 'baudrate=115200
boot_fdt=no
bootcmd=mmc dev ${mmcdev};if mmc rescan; then echo SD/MMC found on device ${mmcdev};if run loadbootenv; then run importbootenv;fi;echo Checking if uenvcmd is set ...;if test -n $uenvcmd; then echo Running uenvcmd ...;run uenvcmd;fi;echo Running default loaduimage ...;if run loaduimage; then run mmcboot;fi;fi;
bootdelay=1
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
ethact=FEC
ethaddr=00:1f:7b:b0:00:04
ethprime=FEC
fdt_addr=0x11000000
fdt_file=/boot/dtbs/imx6s-wandboard.dtb
fdt_high=0xffffffff
importbootenv=echo Importing environment from mmc (uEnv.txt)...; env import -t $loadaddr $filesize
initrd_high=0xffffffff
ip_dyn=yes
loadaddr=0x12000000
loadbootenv=load mmc ${mmcdev}:${mmcpart} ${loadaddr} /boot/uEnv.txt
loadbootscript=load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
loadfdt=load mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
loaduimage=load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${uimage}
loadzimage=load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${zImage}
mmcargs=setenv bootargs console=${console},${baudrate} ${optargs} root=${mmcroot} rootfstype=${mmcrootfstype} video=${video}
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz ${loadaddr}; else echo WARN: Cannot load the DT; fi; fi; else bootm ${loadaddr}; fi;
mmcdev=0
mmcpart=1
mmcroot=/dev/mmcblk0p1 rw
mmcrootfstype=ext4 rootwait
netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} zImage; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if ${get_cmd} ${fdt_addr} ${fdt_file}; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz ${loadaddr}; else echo WARN: Cannot load the DT; fi; fi; else bootz ${loadaddr}; fi;
script=/boot/boot.scr
uimage=/boot/uImage
update_sd_firmware=if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; if mmc dev ${mmcdev}; then if ${get_cmd} ${update_sd_firmware_filename}; then setexpr fw_sz ${filesize} / 0x200; setexpr fw_sz ${fw_sz} + 1; mmc write ${loadaddr} 0x2 ${fw_sz}; fi; fi
update_sd_firmware_filename=u-boot.imx
zimage=/boot/zImage')

[krovetz]

Thanks for doing this. I updated uboot and put the following uEnv.txt into both /dev/sda1/boot/uEnv.txt and /dev/mmcblk0p1/boot/uEnv.txt (I'm not sure which is controlling).
$this->bbcode_second_pass_code('', 'extraargs=root=/dev/sda1 rootwait')
and it doesn't seem to get picked up.
$this->bbcode_second_pass_code('', '
[root@wand /]# dmesg | grep root
[ 0.000000] Linux version 3.0.35-2-ARCH (nobody@-root-chroot-copy) (gcc version 4.7.2 (GCC) ) #1 SMP PREEMPT Wed Jul 31 15:54:21 CDT 2013
[ 0.000000] Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk0p1 rw rootfstype=ext4 rootwait video=
[ 2.782844] VFS: Mounted root (ext4 filesystem) on device 179:1.')
I've got a USB drive successfully mounting as sda.
$this->bbcode_second_pass_code('', '
[root@wand /]# dmesg | grep sda
[ 3.542575] sd 0:0:0:0: [sda] 118489088 512-byte logical blocks: (60.6 GB/56.5 GiB)
[ 3.556012] sd 0:0:0:0: [sda] Write Protect is off
[ 3.565622] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 3.566339] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 3.604144] sda: sda1 sda2
[ 3.621960] sd 0:0:0:0: [sda] Attached SCSI disk')

[kmihelich]

I didn't put the default environment in a post for my health. Read it, change what needs to be changed in the uEnv.txt.

[krovetz]

Got it. Thanks. The following works for me.
$this->bbcode_second_pass_code('', '
[root@wand ~]# cat /boot/uEnv.txt
mmcroot=/dev/sda1 rw
')
uEnv.txt needs to be on the sd card.