[U-Boot] [GIT] Pull request: u-boot-dfu

[Tom Rini]

On Wed, Aug 17, 2016 at 11:56:59AM +0200, Lukasz Majewski wrote:
> Hi Heiko, Ravi,
> 
> > Hello B, Ravi,
> > 
> > Am 17.08.2016 um 09:40 schrieb B, Ravi:
> > > Hi Heiko
> > >
> > >>>>
> > >>>> is that for master or next ?
> > >
> > >>> This patch _was_ supposed to go to "master"
> > >
> > >>>> Was this build tested ?
> > >
> > >>> Unfortunately, not so thoroughly as I thought.
> > >
> > >>> Moving dfu code to SPL causes following error on some boards:
> > >
> > >>>        arm:  +   smartweb
> > >>> +In file included from ../include/dfu.h:18:0,
> > >>> +                 from ../common/dfu.c:16:
> > >>> +../include/linux/usb/composite.h:331:9: error: requested
> > >>> alignment is +not an integer constant
> > >>> +  struct usb_device_descriptor
> > >>> __aligned(CONFIG_SYS_CACHELINE_SIZE) desc;
> > >>> +         ^
> > >>> +make[3]: *** [spl/common/dfu.o] Error 1
> > >>> +make[2]: *** [spl/common] Error 2
> > >> +make[1]: *** [spl/u-boot-spl] Error 2
> > >>> +make: *** [sub-make] Error 2
> > >
> > > The CONFIG_SYS_CACHELINE_SIZE is not defined for smartweb platform
> > > which is causing build error. By defining this error goes away.
> > > What would be value for cache line size for smartweb platform?
> > > (32/64/..?)
> > 
> > Hups? Which patch introduced this? I wonder if other at91
> > based boards does not show the same error?
> > 
> > The RM for the at91sam9260 says:  8 words cache line size
> > 
> > So 32 would be the correct value.
> 
> Heiko, thanks for your support.
> 
> Ravi, Marek Vasut before accepting PR tests following archs with
> buildman: arm, aarch64, mips, powerpc, nios2 [1]
> 
> Regarding the CONFIG_SYS_CACHELINE_SIZE, some older boards do not
> define it. Hence we have several problems (also with other patches
> http://patchwork.ozlabs.org/patch/657216/).
> 
> IMHO, it would be best to check [1] and then add this define if
> required.
> 
> Or does anybody have any better idea?

This is something we can get right in Kconfig, I believe.  Looking at
the Linux Kernel, the relevant bits I think are in arch/arm/mm/Kconfig:
config ARM_L1_CACHE_SHIFT_6
        bool
        default y if CPU_V7
        help
          Setting ARM L1 cache line size to 64 Bytes.

config ARM_L1_CACHE_SHIFT
        int
        default 6 if ARM_L1_CACHE_SHIFT_6
        default 5

I only hesitate a little as there's not a 1:1 match-up between those
values and all ARMv7 platforms we have today for example.

-- 
Tom
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