Branch relocation fixing at Kernel-compiling with Debian-toolchain

Branch relocation fixing at Kernel-compiling with Debian-toolchain

[Achim Hensel]

Hello, folks 

[I try to build Linux for a R4k Indigo1. I'm using as and ld of the
debian-toolchain with mips-linux-as/mips-linux-ld 2.13.90.0.18
20030121. At the moment, the kernel just compiles, but is not bootable
due to further adaption.]

As I'm not much into MIPS or gas assembler (most experience with 6502),
I would like to have some hints how to work around some kernel-compiling
errors:

When compiling the linux-mips.org kernel from the CVS-MAIN branch,
compiling stopped, as expected at the two assembler files 
entry.S and scall_o32.S in linux/arch/mips/kernel/ (both recent
versions) with a BFD-RELOC_16_PCREL_S2. 

The fix of combining global/local label, mentioned in 
http://sources.redhat.com/ml/binutils/2003-02/msg00205.htm
and other places, got me around the problem. Not every branch needed the
fix. Just one error remains:

In entry.S rev 1.49, around line 63, the branch target label
resume_kernel is defined by either a line statement
(ENTRY(resume_kernel), l.79) or a #definition from an other label (l.
52), depending on some #Config-options.

As work around I hardwired the branch label to one of them.

Any hints to adapt the fix to this problem? 
Diff/Patch for the rest will be posted if requested.

[Now working on with ELF2ECOFF converting]

CU,
	Achim

Re: Branch relocation fixing at Kernel-compiling with Debian-toolchain

[Guido Guenther]

On Wed, May 14, 2003 at 12:31:44PM +0200, Achim Hensel wrote:
> [I try to build Linux for a R4k Indigo1. I'm using as and ld of the
> debian-toolchain with mips-linux-as/mips-linux-ld 2.13.90.0.18
> 20030121. At the moment, the kernel just compiles, but is not bootable
> due to further adaption.]
The simplest fix probably is to use 2.14.90.0.1. I have debs for mips
here if this is of any use.
 -- Guido

r4k Indigo 1 (was Re: Branch relocation fixing at Kernel-compiling with Debian-toolchain)

[Robin Humble]

On Wed, May 14, 2003 at 12:31:44PM +0200, Achim Hensel wrote:
>[I try to build Linux for a R4k Indigo1. I'm using as and ld of the

Please let me know how you go with this... I'd like to try it too.
Are you compiling a generic r4k kernel? Is there much chipset
documentation available?

cheers,
robin

Re: r4k Indigo 1 (was Re: Branch relocation fixing at Kernel-compiling with Debian-toolchain)

[Ralf Baechle]

On Wed, May 14, 2003 at 07:02:27AM -0400, Robin Humble wrote:

> On Wed, May 14, 2003 at 12:31:44PM +0200, Achim Hensel wrote:
> >[I try to build Linux for a R4k Indigo1. I'm using as and ld of the
> 
> Please let me know how you go with this... I'd like to try it too.
> Are you compiling a generic r4k kernel? Is there much chipset
> documentation available?

Little; however it's know that the machine is relativly similar to the
Indy for example so it seems doable for somebody with enough time.

  Ralf

Re: r4k Indigo 1 (was Re: Branch relocation fixing at Kernel-compiling with Debian-toolchain)

[Guido Guenther]

On Wed, May 14, 2003 at 08:00:34PM +0200, Ralf Baechle wrote:
> Little; however it's know that the machine is relativly similar to the
> Indy for example so it seems doable for somebody with enough time.
Maybe I'm stating the obvious but good look into Irix's /usr/include
helps a lot. It seems to have almost everything in it to get the Indigo
going (without serial consoel of course).
 -- Guido

Re: r4k Indigo 1 (was Re: Branch relocation fixing at Kernel-compiling with Debian-toolchain)

[Guido Guenther]

On Wed, May 14, 2003 at 08:32:18PM +0200, Guido Guenther wrote:
> On Wed, May 14, 2003 at 08:00:34PM +0200, Ralf Baechle wrote:
> > Little; however it's know that the machine is relativly similar to the
> > Indy for example so it seems doable for somebody with enough time.
> Maybe I'm stating the obvious but good look into Irix's /usr/include
> helps a lot. It seems to have almost everything in it to get the Indigo
> going (without serial consoel of course).
_without_ fb and _with_ serial console only is what I wanted to say.
 -- Guido

Re: r4k Indigo 1 (was Re: Branch relocation fixing at Kernel-compiling with Debian-toolchain)

[Ralf Baechle]

On Wed, May 14, 2003 at 08:42:24PM +0200, Guido Guenther wrote:

> > > Little; however it's know that the machine is relativly similar to the
> > > Indy for example so it seems doable for somebody with enough time.
> > Maybe I'm stating the obvious but good look into Irix's /usr/include
> > helps a lot. It seems to have almost everything in it to get the Indigo
> > going (without serial consoel of course).
> _without_ fb and _with_ serial console only is what I wanted to say.
>  -- Guido

Thta still leaves alot of details open - but yes, it's certainly a step
into the right direction.  And there's always the hope once there is a
start somebody at SGI will throw real docs into our direction ...

  Ralf