Re: linux 4.2-rc1 broken Nokia N900

Michael Welling
2015-07-13T20:30:15Z

On Mon, Jul 13, 2015 at 07:09:06PM +0200, Pali Rohár wrote:
> Hello, here is my objdump of 4.2-rc2 version:
>
> 00000064 <omap2_mcspi_set_cs>:
> 64: e3003182 movw r3, #386 ; 0x182
> 68: e19030b3 ldrh r3, [r0, r3]
> 6c: e3130004 tst r3, #4
> 70: 0a000001 beq 7c <omap2_mcspi_set_cs+0x18>
> 74: e2711001 rsbs r1, r1, #1
> 78: 33a01000 movcc r1, #0
> 7c: e5902188 ldr r2, [r0, #392] ; 0x188
> 80: e3520000 cmp r2, #0
> 84: 012fff1e bxeq lr
> 88: e5923018 ldr r3, [r2, #24]
> 8c: e3510000 cmp r1, #0
> 90: 13c33601 bicne r3, r3, #1048576 ; 0x100000
> 94: 03833601 orreq r3, r3, #1048576 ; 0x100000
> 98: e5823018 str r3, [r2, #24]
> 9c: e5902188 ldr r2, [r0, #392] ; 0x188
> a0: e5922000 ldr r2, [r2]
> a4: e582302c str r3, [r2, #44] ; 0x2c
> a8: e592302c ldr r3, [r2, #44] ; 0x2c
> ac: e12fff1e bx lr

I have not been able to duplicate the failure on the hardware that I have.
I dug out my old Beagleboard and added an SPI registration to the dts.
This was the closest hardware that I had to the N900's processor.

What is the version of the gcc compiler you are using and where did you
get it from?

For instance, I am using a 4.9.1 compiler that I built using Yocto.

Also are you using devicetree or the old board file board-rx51.c?