[U-Boot] U-boot configuration

[U-Boot] U-boot configuration

[A.W.C.]

Hello,

Linux embedded file system (Linux v. 2.6.26.5) running on raw NAND flash, and use Full Image's RootFS.
I need to access to linux shell when Linux kernel already is fully loaded and make some changes.

U-boot> setenv bootargs console=ttyS1,115200n8 rootfstype=squashfs noalign half_image=0 verify=y single init=/bin/sh

BusyBox v1.10.2 (2017-08-02 14:07:25 CST) built-in shell (ash)
When I access to Busybox emergency shell, Linux kernel is not fully loaded, actual root partition is not mounted yet, the available commands are very limited.

BusyBox v1.10.2 (2015-09-06 10:58:05 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/bin/sh: can't access tty; job control turned off
# help

Built-in commands:
-------------------
    . : [ [[ alias bg break cd chdir continue echo eval exec exit
    export false fg hash help jobs let local pwd read readonly return
    set shift source test times trap true type ulimit umask unalias
    unset wait

# fdisk -l
/bin/sh: fdisk: not found
#

# mount
mount: no /proc/mounts
#

How to get Linux Kernel fully loaded, and MTD-devices mounted, at the same time having full access to file system from Busybox emergency shell?


Regards,

[U-Boot] U-boot configuration

[Lukasz Majewski]

On Thu, 30 Nov 2017 13:21:24 +0000 (UTC)
"A.W.C." <bluestream@ymail.com> wrote:

> Hello,
> 
> Linux embedded file system (Linux v. 2.6.26.5) running on raw NAND
> flash, and use Full Image's RootFS. I need to access to linux shell
> when Linux kernel already is fully loaded and make some changes.
> 
> U-boot> setenv bootargs console=ttyS1,115200n8 rootfstype=squashfs
> noalign half_image=0 verify=y single init=/bin/sh
> 
> BusyBox v1.10.2 (2017-08-02 14:07:25 CST) built-in shell (ash)
> When I access to Busybox emergency shell, Linux kernel is not fully
> loaded, actual root partition is not mounted yet, the available
> commands are very limited.
> 
> BusyBox v1.10.2 (2015-09-06 10:58:05 CST) built-in shell (ash)
> Enter 'help' for a list of built-in commands.
> 
> /bin/sh: can't access tty; job control turned off
> # help
> 
> Built-in commands:
> -------------------
>     . : [ [[ alias bg break cd chdir continue echo eval exec exit
>     export false fg hash help jobs let local pwd read readonly return
>     set shift source test times trap true type ulimit umask unalias
>     unset wait
> 
> # fdisk -l
> /bin/sh: fdisk: not found
> #
> 
> # mount
> mount: no /proc/mounts
> #
> 
> How to get Linux Kernel fully loaded, and MTD-devices mounted, at the
> same time having full access to file system from Busybox emergency
> shell?

Your kernel is already loaded (as you are in /bin/sh )... The only
problem is with modules, which may not be loaded.

Try to mount manually stuff from inittab (sysfs, procfs), load needed
modules (to handle file systems) and then mount them.

> 
> 
> Regards,
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> https://lists.denx.de/listinfo/u-boot



Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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[U-Boot] U-Boot configuration

[Axel Beierlein]

Hello,

we use an TQM5200 Board on an own designed Baseboard than the TB5200 or  
STK52xx.
Do we have to reconfigure the U-boot Source for this new baseboard?
And specially, is it necessary to disable the PCI Bus in the U-Boot  
Sources when we don?t use this Bus?

Axel Beierlein