[PATCH v1.0 2/4] TS72XX: Allow to override machine ID

[Mikael Pettersson]

Christian Gagneraud writes:
 > H Hartley Sweeten wrote:
 > > On Saturday, October 03, 2009 6:14 PM, Christian Gagneraud wrote:
 > >> From: Matthieu Crapet <mcrapet at gmail.com>
 > >>
 > >> In early days Technologic Systems fixed the 0x163 value in redboot
 > >> instead of 0x2a1, this patch allow to overwrite it.
 > >>
 > >> Signed-off-by: Matthieu Crapet <mcrapet at gmail.com>
 > >> Signed-off-by: Christian Gagneraud <cgagneraud at techworks.ie>
 > > 
 > > As others have already pointed out, this is a pure hack and not
 > > suitable for mainline.
 > > 
 > > The bootloader for systems that needs this really should be updated.
 > > Machine ID 0x163 (355) is ARCH_CX861XX which isn't an ep93xx based
 > > system and doesn't even have a platform init in mainline.
 > 
 > I see your point, but what if the bootloader can't be updated? Does 
 > that mean that people using these boards will have to bother with 
 > applying patches on mainline kernel for ever?
 > Can't we find a way to address this issue, I'm pretty sure this is not 
 > the only board that need this kind of asm hack.

All you need to do is to wrap the kernel binary image with
a small shim that corrects the Machine ID in r1. devio can
do that, as can (I think) printf(1).

No need to replace the bootloader or hack the kernel.