[U-Boot-Users] kernel bootparams

[U-Boot-Users] kernel bootparams

[himbA]

Hello

I have a board, pxa based, and it has u-boot burnt, but i don't have the 
source from which it was compiled from, so i don't have any config 
setting (got the board as-is).

for now booting is made from flash, loading both kernel and ramdisk. i 
want to try nfs based booting and first strange thing i notice when 
kernel gets booted is that kernel parameters are always the same, no 
matter to what i set 'bootargs' var in u-boot. it always displays
....
Kernel command line: root=/dev/ram0 console=ttyS0,115200 mem=64M
....
and hangs at
....
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 4096 bind 8192)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NetWinder Floating Point Emulator V0.95 (c) 1998-1999 Rebel.com
Kernel panic: VFS: Unable to mount root fs on 01:00


although passed bootargs says:
bootargs=root=/dev/nfs rw nfsroot=10.10.10.1:/tftpboot/10.10.10.1 
ip=10.10.10.2:10.10.10.1::255.255.255.0:xcep:: console=ttyS0,115200 mem=64M

I also tried changing CONFIG_CMDLINE setting in .config of the kernel to 
same value as bootargs but still notihng changed.

If CONFIG_BOOTARGS var in u-boot is specified during compile time, does 
it interfere with bootargs passed at boot time ?

i will copile u-boot from CVS tomorrow (need to create new board 
defines), just need to clear some stuff now...

regards, himba

[U-Boot-Users] kernel bootparams

[Wolfgang Denk]

In message <402AB73F.5010803@email.si> you wrote:
> 
> I have a board, pxa based, and it has u-boot burnt, but i don't have the 
> source from which it was compiled from, so i don't have any config 
> setting (got the board as-is).

Then request the source from the guys who gave/sold  you  the  board.
U-Boot  is  under  GPL  and  they MUST give you the full source code,
including all modifications they might have made, _ffor_free_.

> for now booting is made from flash, loading both kernel and ramdisk. i 
> want to try nfs based booting and first strange thing i notice when 
> kernel gets booted is that kernel parameters are always the same, no 
> matter to what i set 'bootargs' var in u-boot. it always displays

Probably the kernel uses it's own bootstrap loader which  includes  a
hard-wired command line.

> I also tried changing CONFIG_CMDLINE setting in .config of the kernel to 
> same value as bootargs but still notihng changed.
> 
> If CONFIG_BOOTARGS var in u-boot is specified during compile time, does 
> it interfere with bootargs passed at boot time ?

No, this is just the default value which can be  overwritten  by  the
standard setenv command.

> i will copile u-boot from CVS tomorrow (need to create new board 
> defines), just need to clear some stuff now...

Complain at the guys who gave you the board!!

Best regards,

Wolfgang Denk

-- 
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"I knew then (in 1970) that a 4-kbyte minicomputer would cost as much
as a house. So I reasoned  that  after  college,  I'd  have  to  live
cheaply in an apartment and put all my money into owning a computer."
      - Apple co-founder Steve Wozniak, EE Times, June 6, 1988, pg 45

[U-Boot-Users] kernel bootparams

[himbA]

i apoligize since i sent first reply to Wolfgang Denk only, my mail 
client tricked me :)

Wolfgang Denk wrote:
> In message <402AB73F.5010803@email.si> you wrote:
> 
>>I have a board, pxa based, and it has u-boot burnt, but i don't have the 
>>source from which it was compiled from, so i don't have any config 
>>setting (got the board as-is).
> 
> 
> Then request the source from the guys who gave/sold  you  the  board.
> U-Boot  is  under  GPL  and  they MUST give you the full source code,
> including all modifications they might have made, _ffor_free_.
> 
got it today, the forgot to include on the cd they gave me.
> 
>>for now booting is made from flash, loading both kernel and ramdisk. i 
>>want to try nfs based booting and first strange thing i notice when 
>>kernel gets booted is that kernel parameters are always the same, no 
>>matter to what i set 'bootargs' var in u-boot. it always displays
> 
> 
> Probably the kernel uses it's own bootstrap loader which  includes  a
> hard-wired command line.
and how could i tell if such bootstrap loader exists ? as far as i know
there is nothing present on flash except u-boot and u-boot env.
> 
> 
>>I also tried changing CONFIG_CMDLINE setting in .config of the kernel to 
>>same value as bootargs but still notihng changed.
>>
>>If CONFIG_BOOTARGS var in u-boot is specified during compile time, does 
>>it interfere with bootargs passed at boot time ?
> 
> 
> No, this is just the default value which can be  overwritten  by  the
> standard setenv command.
> 
ok, that means kernel line supplied to the kernel is hardwired, i guess,
somewhere else.
> 
>>i will copile u-boot from CVS tomorrow (need to create new board 
>>defines), just need to clear some stuff now...
> 
> 
> Complain at the guys who gave you the board!!
>
i did, and i got it - but they have 1.0.0 sources ported and said they
tried porting cvs version, but had some problems.
are there major changes from 1.0.0 and current cvs (1.0.2)? it is only a
patch revision according to numbering in README as I recall, so how
different could it be.

> Best regards,
> 
> Wolfgang Denk
> 

thank, you

regards, himba