Re: [Gumstix-users] Configuring bootargs from menuconfig

[Craig H. <cr...@gu...>]

On Jul 31, 2007, at 10:41 AM, Matt Aprea wrote:

> Is there anyone out there that knows how to configure the bootargs  
> variable
> through the menuconfig system when generating the file system? From  
> the
> Linux menuconfig there is a "Boot Options" submenu that contains a
> configuration item called "Default kernel command string" that  
> seems to be
> tied to the configuration variable CONFIG_CMDLINE. The default for  
> this is
> CONFIG_CMDLINE="console=ttyS0,115200n8 root=1f01 rootfstype=jffs2.  
> Which
> seems to be the same value that the bootargs variable has when the  
> Gumstx is
> first flashed. However I've noticed that even if I change this  
> value and
> rebuild, the bootargs variable still has the default after  
> flashing. So, I'm
> wondering if this is the right place to make this change? Can  
> anyone suggest
> another means to influence the initial value of the bootargs variable?

That option in linux affects how the kernel boots if no arg is passed  
on the kernel command line -- u-boot will always pass one though if  
its bootargs variable is set.  To change this arg at compile-time,  
you'll need to do it in u-boot, not in the kernel.  To do that,  
you'll need to edit the file

buildroot/build_arm_nofpu/u-boot-*/include/configs/gumstix.h

Look for the line

#define CONFIG_BOOTARGS ...

and change that definition, then re-build u-boot.  You can change it  
in the file

target/arm/u-boot/verdex/base.patch
or
target/arm/u-boot/basix-connex/base.patch

instead and then rm -rf build_arm_nofpu/u-boot* then rebuild if you  
want it to be done automatically.

C