linux-kernel - Re: linux 4.2-rc1 broken Nokia N900

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Date:	Mon, 13 Jul 2015 15:28:35 -0500
From:	Michael Welling <mwelling@...e.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Sebastian Reichel <sre@...nel.org>,
	Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Nishanth Menon <nm@...com>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: linux 4.2-rc1 broken Nokia N900

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?

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