linux-kernel - Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler

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Message-ID: <20220708171227.74nbcgsk63y4bdna@pali>
Date:   Fri, 8 Jul 2022 19:12:27 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Michael Ellerman <michael@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler

On Monday 04 July 2022 14:07:10 Arnd Bergmann wrote:
> Another problem I see is that a kernel that is built for both E500 and E500MC
> uses -mcpu=e500mc and may not actually work on the older ones either
> (even with your patch).

Such configuration is not supported, see arch/powerpc/platforms/Kconfig.cputype:

config PPC_E500MC
	bool "e500mc Support"
	select PPC_FPU
	select COMMON_CLK
	depends on E500
	help
	  This must be enabled for running on e500mc (and derivatives
	  such as e5500/e6500), and must be disabled for running on
	  e500v1 or e500v2.

Based on this option you can enable either support for e500v1/e500v2 or
for e500mc. But not both.