[clug] ARM devices with complete upstream support

[Eyal Lebedinsky]

Another data point:
	I tested with rpi_2_defconfig which does work... I assume Chris built so.
Maybe I should leave the raspi3 alone for now.

Eyal

On 10/28/16 14:38, Eyal Lebedinsky wrote:
> On 10/27/16 21:37, Chris Smart wrote:
>> On Wed, Oct 26, 2016 at 12:09:47PM +1100, Chris Smart wrote:
>>> Every week there's a new cute little ARM device, but almost all use some
>>> ancient fork of the Linux kernel and U-Boot, rendering them less than
>>> ideal (well useless, IMO).
>>>
>>
>> And if anyone's interested on how to build your upstream kernel and U-Boot
>> for Raspberry Pi 2/3, I've just put that on my blog too.
>>
>> <https://blog.christophersmart.com/2016/10/27/building-and-booting-upstream-linux-and-u-boot-for-raspberry-pi-23-arm-boards/>
>
> Thanks  Chris,
>
> I thought I should give it a test for my raspi3. I followed the instructions verbatim but it failed (see below).
> I am on f24.
>
> Some nitpicking though:
>
>  "Assuming your card is at /dev/sdx (replace as necessary, check dmesg after plugging it in if you’re not sure)"
>   I suggest you remove the "if...". Always check, the cost of a mistake can be catastrophic.
>
> "sudo mount /dev/sdb1 /mnt" should say "sdx1".
>
> cheers
>
>> -c
>
> $ CROSS_COMPILE=arm-linux-gnu- make rpi_3_defconfig
>   HOSTCC  scripts/basic/fixdep
>   HOSTCC  scripts/kconfig/conf.o
>   SHIPPED scripts/kconfig/zconf.tab.c
>   SHIPPED scripts/kconfig/zconf.lex.c
>   SHIPPED scripts/kconfig/zconf.hash.c
>   HOSTCC  scripts/kconfig/zconf.tab.o
>   HOSTLD  scripts/kconfig/conf
> #
> # configuration written to .config
> #
>
> $ CROSS_COMPILE=arm-linux-gnu- make -j$(nproc)
> scripts/kconfig/conf  --silentoldconfig Kconfig
> ...
> ... many warnings:
>         warning: right shift count >= width of type [-Wshift-count-overflow]
> ... then errors:
> {standard input}: Assembler messages:
> {standard input}:33: Error: selected processor does not support requested special purpose register -- `mrs r0,cntfrq_el0'
> {standard input}:64: Error: selected processor does not support requested special purpose register -- `mrs r0,cntpct_el0'
> {standard input}:97: Error: selected processor does not support requested special purpose register -- `mrs r2,cntfrq_el0'
> {standard input}:119: Error: selected processor does not support requested special purpose register -- `mrs r3,cntfrq_el0'
> scripts/Makefile.build:280: recipe for target 'arch/arm/cpu/armv8/generic_timer.o' failed
> make[1]: *** [arch/arm/cpu/armv8/generic_timer.o] Error 1
> make[1]: *** Waiting for unfinished jobs....
> ...
> cc1: warning: unknown register name: x18
> scripts/Makefile.build:280: recipe for target 'arch/arm/cpu/armv8/cache_v8.o' failed
> make[1]: *** [arch/arm/cpu/armv8/cache_v8.o] Error 1
> Makefile:1221: recipe for target 'arch/arm/cpu/armv8' failed
> make: *** [arch/arm/cpu/armv8] Error 2
>   LD      arch/arm/mach-bcm283x/built-in.o
>

-- 
Eyal Lebedinsky (eyal at eyal.emu.id.au)