How to add the bootargs parameter between the bootcmds parameters

[Mario Marietto]

Hello to everyone.

These days I'm playing with my old ARM Chromebook model "SNOW". As you
probably know,this kind of Netbook can load an external operating system
using the sd card slot or the usb port. Unfortunately,my Chromebook has the
sd card slot broken. So,what I want to do is to load Linux using the usb
port. I've bought one converter from sd card to usb and I've installed
Devuan 5 on the sd card ; I have inserted the sd card inside the adapter
and would like to boot Linux (Devuan 5) through it. The u-boot version that
I have installed is special because the code contains the patches needed to
enable kvm. You should also know that the parameters to boot Linux are
embedded inside the code,as you can see below :

https://github.com/virtualopensystems/u-boot/blob/eecfeb578e296ef3b739ac918a39b6c177dff58a/include/configs/snow.h#L101

now. I've tried many times to recompile it,trying to change the root device
from /dev/mmcblk1p4 to /dev/sda4,because sda4 is the root device
now,because the Linux files are stored on the sd card,partition 4,but I
failed every time. Now I want to use another method to bypass the
"root=/dev/mmcblk1p4"
parameter. This is what I did :

setenv bootcmd "usb start ; usb dev 0 ; ext2load usb 0:3 0x80008000 uImage
; ext2load usb 0:3 0x43000000 exynos5250-snow.dtb ; bootargs console=tty1
root=/dev/sda4 rw rootwait clk_ignore_unused --no-log ; bootm 0x80008000 -
0x43000000"
saveenv
boot

Well,it does not work because despite the fact that I have said to choose
sda4 as the root device,it persists to use mmcblk1p4. This is the message
reported :

waiting for root device /dev/mmcblk1p4
sda attached SCSI removable disk...

I would like to know if I have written the parameters correctly. I don't
see errors. The only problem is that it does not pick sda4.

Let me know,thanks.

-- 
Mario.