Re: linux 4.2-rc1 broken Nokia N900

[Michael Welling <mwelling@ieee.org>]

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?

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