linux-kernel - Re: [PATCH v5 01/13] powerpc: Remove Xilinx PPC405/PPC440 support

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Date:   Wed, 17 Jun 2020 11:16:42 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Michal Simek <michal.simek@...inx.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Arnd Bergmann <arnd@...db.de>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH v5 01/13] powerpc: Remove Xilinx PPC405/PPC440 support

On Wed, Jun 17, 2020 at 3:20 AM Michael Ellerman <mpe@...erman.id.au> wrote:
>
> Michael Ellerman <mpe@...erman.id.au> writes:
> > Michal Simek <michal.simek@...inx.com> writes:
> <snip>
>
> >> Or if bamboo requires uImage to be built by default you can do it via
> >> Kconfig.
> >>
> >> diff --git a/arch/powerpc/platforms/44x/Kconfig
> >> b/arch/powerpc/platforms/44x/Kconfig
> >> index 39e93d23fb38..300864d7b8c9 100644
> >> --- a/arch/powerpc/platforms/44x/Kconfig
> >> +++ b/arch/powerpc/platforms/44x/Kconfig
> >> @@ -13,6 +13,7 @@ config BAMBOO
> >>         select PPC44x_SIMPLE
> >>         select 440EP
> >>         select FORCE_PCI
> >> +       select DEFAULT_UIMAGE
> >>         help
> >>           This option enables support for the IBM PPC440EP evaluation board.
> >
> > Who knows what the actual bamboo board used. But I'd be happy to take a
> > SOB'ed patch to do the above, because these days the qemu emulation is
> > much more likely to be used than the actual board.
>
> I just went to see why my CI boot of 44x didn't catch this, and it's
> because I don't use the uImage, I just boot the vmlinux directly:
>
>   $ qemu-system-ppc -M bamboo -m 128m -display none -kernel build~/vmlinux -append "console=ttyS0" -display none -nodefaults -serial mon:stdio
>   Linux version 5.8.0-rc1-00118-g69119673bd50 (michael@...ine1-p1) (gcc (Ubuntu 9.3.0-10ubuntu2) 9.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #4 Wed Jun 17 20:19:22 AEST 2020
>   Using PowerPC 44x Platform machine description
>   ioremap() called early from find_legacy_serial_ports+0x690/0x770. Use early_ioremap() instead
>   printk: bootconsole [udbg0] enabled
>
>
> So that's probably the simplest solution?

If the uImage or zImage self decompresses, I would prefer to test that as well.

> That means previously arch/powerpc/boot/zImage was just a hardlink to
> the uImage:

It sounds like we can just boot the zImage, or is that no longer
created with the uImage?
-- 
Thanks,
~Nick Desaulniers