[U-Boot] howto deal with nested $() in bootenv?

[U-Boot] howto deal with nested $() in bootenv?

[Arno Steffen]

To set my uboot environment (2008-10) I upload a script to uboot

set serverip 		192.168.90.230
a) set bootargs_nfs    mem=128M console=ttyS2,115200n8 noinitrd rw
root=/dev/nfs nfsroot=$(serverip):/opt/rootfs, nolock
b) set bootargs_nfs    mem=128M console=ttyS2,115200n8 noinitrd rw
root=/dev/nfs nfsroot=\$(serverip):/opt/rootfs, nolock
set boot_nfs		tftpboot 0x80000000 spv/uImage\; set bootargs
\$(bootargs_nfs)\; run addip\; bootm 0x80000000

I case a) the serverip while loading will inserted fix in bootargs_nfs
In case b) the serverip will not replaced so that the kernel get a
$(serverip) part of command line.

How to change this above, so that I can later change serverip without
changing anything else?

Regards
Arno

[U-Boot] howto deal with nested $() in bootenv?

[Wolfgang Denk]

Dear Arno Steffen,

In message <804f0d21003040708h672d4814m6e1c4d5f32ea9c47@mail.gmail.com> you wrote:
> To set my uboot environment (2008-10) I upload a script to uboot
...
> I case a) the serverip while loading will inserted fix in bootargs_nfs
> In case b) the serverip will not replaced so that the kernel get a
> $(serverip) part of command line.
> 
> How to change this above, so that I can later change serverip without
> changing anything else?

Please RTFM, thsi specific use case is explaind in detaiul there. See
especially section "7.4. Boot Arguments Unleashed" at
http://www.denx.de/wiki/view/DULG/LinuxBootArgs

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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
I have often regretted my speech, never my silence.

[U-Boot] howto deal with nested $() in bootenv?

[Arno Steffen]

Dear Wolfgang,

I read that chapter and changed to
set bootargs_nfs    'setenv bootargs mem=128M console=ttyS2,115200n8
noinitrd rw root=/dev/nfs nfsroot=${serverip}:/opt/rootfs, nolock'
set boot_nfs		'run bootargs_nfs addip; printenv bootargs; tftpboot
0x80000000 uImage;  bootm 0x80000000'
set bootcmd run boot_nfs

The result keeps the same. For some strange reason I can see the
result of printenv command, that I inserted for debug purposes. The
serverip is not replaced.
What is working is executing to type

"run bootargs_nfs addip" as a single command line
"print bootargs" than returns the correct:
bootargs=mem=128M console=ttyS2,115200n8 noinitrd rw root=/dev/nfs nfsroot=192.1
68.90.230:/opt/rootfs, nolock ip=192.168.90.202:192.168.90.230:192.168.90.1:255.
255.255.0::eth0:on

This single line seems to be executed in a different way?!

Best regards
Arno



2010/3/4 Wolfgang Denk <wd@denx.de>:
> Dear Arno Steffen,
>
> In message <804f0d21003040708h672d4814m6e1c4d5f32ea9c47@mail.gmail.com> you wrote:
>> To set my uboot environment (2008-10) I upload a script to uboot
> ...
>> I case a) the serverip while loading will inserted fix in bootargs_nfs
>> In case b) the serverip will not replaced so that the kernel get a
>> $(serverip) part of command line.
>>
>> How to change this above, so that I can later change serverip without
>> changing anything else?
>
> Please RTFM, thsi specific use case is explaind in detaiul there. See
> especially section "7.4. Boot Arguments Unleashed" at
> http://www.denx.de/wiki/view/DULG/LinuxBootArgs
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH, ? ? MD: Wolfgang Denk & Detlev Zundel
> 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
> I have often regretted my speech, never my silence.
>

[U-Boot] howto deal with nested $() in bootenv?

[Wolfgang Denk]

Dear Arno Steffen,

In message <804f0d21003042336t222c9e65v18ab2f193ff3e81@mail.gmail.com> you wrote:
>
> I read that chapter and changed to
> set bootargs_nfs    'setenv bootargs mem=128M console=ttyS2,115200n8
> noinitrd rw root=/dev/nfs nfsroot=${serverip}:/opt/rootfs, nolock'
> set boot_nfs		'run bootargs_nfs addip; printenv bootargs; tftpboot
> 0x80000000 uImage;  bootm 0x80000000'
> set bootcmd run boot_nfs
>
> The result keeps the same. For some strange reason I can see the
> result of printenv command, that I inserted for debug purposes. The
> serverip is not replaced.
> What is working is executing to type
>
> "run bootargs_nfs addip" as a single command line
> "print bootargs" than returns the correct:
> bootargs=mem=128M console=ttyS2,115200n8 noinitrd rw root=/dev/nfs > nfsroot=192.1
> 68.90.230:/opt/rootfs, nolock ip=192.168.90.202:192.168.90.230:192.168.90> .1:255.
> 255.255.0::eth0:on
>
> This single line seems to be executed in a different way?!

This most probably means that the "serverip" which does not get
substituted is not the "serverip" you tink it is, i. e. eventually it
contains some non-printing characters or control sequences. I
recommend to re-enter the complete variable definition. Do not copy &
paste, but re-type it from scratch. Then test again.

You can also run "md" on the sector where your environment is stored,
and check what's actually stored there.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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
I haven't lost my mind -- it's backed up on tape somewhere.