set root variable for uImage?

[Sascha Hauer]

On Thu, Jul 04, 2013 at 12:30:15PM +0200, Adam Furmanczuk wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hi Sascha, hi Alexander,
> 
> rootwait parameter in bootargs did not helped. I compiled barebox and
> kernel Image from busybox. I added in busybox extra defconfig
> parameter for the imx53 board for barebox. No extra pachtes. Have sdma
> module in root partion in /lib directory, but it never change-roots to
> that partition anyway.
> 
> With u-Boot the same bootargs are OK. My new project requires to use
> barebox.
> 
> Output of devinfo global [1] and bootlog [2]

Please send these inline next time so that people digging through the
archives can see what we are talking about.

> 
> Greetings,
> 
> Adam
> 
> 
> [1] http://pastebin.com/yyQjtpbT

> barebox at Freescale i.MX53 LOCO:/ devinfo global 
> resources:
> driver: none
> bus: none
> 
> Parameters:
>     system.reset = POR
>      bootm.image = 
>     bootm.oftree = 
>     bootm.initrd = 
>    dhcp.rootpath = 
> dhcp.tftp_server_name = 
>    dhcp.bootfile = 
> dhcp.oftree_file = 
>   dhcp.vendor_id = 
>   dhcp.client_id = 
>  dhcp.user_class = 
> dhcp.client_uuid = 
>         hostname = loco
>             user = none
> autoboot_timeout = 3
>     boot.default = net
>      allow_color = true
> linux.bootargs.base = console=ttymxc0,115200
> linux.bootargs.dyn.ip = 
> linux.bootargs.dyn.root =

Ok, that's the information I was looking for.

The bootm command either uses the 'bootargs' variable or if exists, all
variables beginning with "linux.bootargs.".

So to change your bootargs do:

linux.bootargs.base="console=ttymxc0,115200 ignore_loglevel whatever"

You can also add new variables:

global linux.bootargs.debug="earlyprintk"

And what you are currently looking for:

global linux.bootargs.root="root=/dev/mmcblk0p3 rootwait"

> [2] http://pastebin.com/4PxUnm0Q

> barebox at Freescale i.MX53 LOCO:/mkdir /mnt/disk1
> barebox at Freescale i.MX53 LOCO:/ bootargs="root=/dev/mmcblk0p3 rootwait
> rootfstype=ext4"
> barebox at Freescale i.MX53 LOCO:/ mount /dev/disk0.1 fat /mnt/disk1
> barebox at Freescale i.MX53 LOCO:/ bootm /mnt/disk1/uImage
>    Image Name:   Linux-2.6.35.3
>    Created:      2013-06-13  14:17:14 UTC
>    OS:           Linux
>    Architecture: ARM
>    Type:         Kernel Image
>    Compression:  uncompressed
>    Data Size:    2945628 Bytes = 2.8 MiB
>    Load Address: 70008000
>    Entry Point:  70008000
>  
> Loading OS U-Boot uImage '/mnt/disk1/uImage'
> commandline: console=ttymxc0,115200  
> arch_number: 3273
> Linux version 2.6.35.3 (testserver at Server6) (gcc version 4.7.3

Quite an old Kernel for a new project...

> (Buildroot 2013.05) ) #1 PREEMPT Thu Jun 13 16:17:07 CEST 2013
> CPU: ARMv7 Processor [412fc085] revision 5 (ARMv7), cr=10c53c7f
> CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
> Machine: Freescale MX53 LOCO Board
> Memory policy: ECC disabled, Data cache writeback
> Built 1 zonelists in Zone order, mobility grouping on.  Total pages:
> 250880
> Kernel command line: console=ttymxc0,115200

Here you see the command line.

Sascha

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