Re: linux 4.2-rc1 broken Nokia N900

["Pali Rohár" <pali.rohar@gmail.com>]

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On Monday 13 July 2015 23:52:32 Michael Welling wrote:
> On Mon, Jul 13, 2015 at 10:34:21PM +0200, Pali Rohár wrote:
> > On Monday 13 July 2015 22:28:35 Michael Welling wrote:
> > > 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?
> > 
> > I'm using gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) from
> > package gcc-4.6-arm-linux-gnueabi which is available on Ubuntu
> > 12.04 LTS (version 4.6.3-1ubuntu5cross1.62).
> 
> I downloaded and compiled with this compiler and it still does not
> effect the functionality of the targets that I have.
> 
> What flags (if any) are you passing to the compiler?
> 

I think nothing special. I just call:

export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabi-
make rx51_defconfig
rm -f arch/arm/boot/zImage
make -j12 zImage modules omap3-n900.dtb CONFIG_DEBUG_SECTION_MISMATCH=y
cat arch/arm/boot/zImage arch/arm/boot/dts/omap3-n900.dtb > arch/arm/boot/zImage.new
mv arch/arm/boot/zImage.new arch/arm/boot/zImage

> Here is my objdump with gcc version 4.6.3 (Ubuntu/Linaro
> 4.6.3-1ubuntu5): 00000074 <omap2_mcspi_set_cs>:
>       74:       e59f304c        ldr     r3, [pc, #76]   ; c8
> <omap2_mcspi_set_cs+0x54> 78:       e19030b3        ldrh    r3, [r0,
> r3]
>       7c:       e3130004        tst     r3, #4
>       80:       0a000001        beq     8c <omap2_mcspi_set_cs+0x18>
>       84:       e2711001        rsbs    r1, r1, #1
>       88:       33a01000        movcc   r1, #0
>       8c:       e5903258        ldr     r3, [r0, #600]  ; 0x258
>       90:       e3530000        cmp     r3, #0
>       94:       012fff1e        bxeq    lr
>       98:       e5932018        ldr     r2, [r3, #24]
>       9c:       e3510000        cmp     r1, #0
>       a0:       13c22601        bicne   r2, r2, #1048576        ;
> 0x100000 a4:       03822601        orreq   r2, r2, #1048576        ;
> 0x100000 a8:       e5832018        str     r2, [r3, #24]
>       ac:       e5903258        ldr     r3, [r0, #600]  ; 0x258
>       b0:       e5933000        ldr     r3, [r3]
>       b4:       e583202c        str     r2, [r3, #44]   ; 0x2c
>       b8:       e5903258        ldr     r3, [r0, #600]  ; 0x258
>       bc:       e5933000        ldr     r3, [r3]
>       c0:       e593202c        ldr     r2, [r3, #44]   ; 0x2c
>       c4:       e12fff1e        bx      lr
>       c8:       00000252        .word   0x00000252
> 
> > > 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?
> > 
> > I'm using devicetree.

-- 
Pali Rohár
pali.rohar@gmail.com

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