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arch/powerpc: Enable powerpc64le only on CPUs that support it

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Invalid configurations lead to build failures, such as trying to enable
ppc64le for the ppc970:

  http://autobuild.buildroot.net/results/fda886768fce25ccd9b52b635ff5b13da7ba2d0c/

In order to run a ppc64le userspace a kernel that runs in this mode is
required. The only CPU supported in buildroot that can boot a ppc64le
kernel is Power8, so mark all of the other 64-bit capable CPUs as not
supporting ppc64le. For Power7, the situation is not so clear, but there
are anyway no commercially available CPUs for that architecture so it
doesn't matter much either way. Let's be safe and disable LE on that one
as well.

This drops the comment about libc, which is true but doesn't tell the
whole story.

Note that we use positive logic for the new conditions, while the rest
of the file uses negative logic. We'll fix that for the rest of the file
in a follow-up patch.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[Arnout: don't remove 32-bit support for POWER5+]
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
This commit is contained in:
Joel Stanley 2022-07-29 09:38:58 +09:30 committed by Arnout Vandecappelle
parent 17e44d6603
commit fdb23693a4
1 changed files with 3 additions and 4 deletions
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7
arch/Config.in.powerpc
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@ -67,11 +67,9 @@ config BR2_powerpc_604e
depends on !BR2_ARCH_IS_64
config BR2_powerpc_620
bool "620"
# No C library supports this variant on ppc64le
depends on !BR2_powerpc64le
config BR2_powerpc_630
bool "630"
# No C library supports this variant on ppc64le
depends on !BR2_powerpc64le
config BR2_powerpc_740
bool "740"
@ -98,6 +96,7 @@ config BR2_powerpc_860
depends on !BR2_ARCH_IS_64
config BR2_powerpc_970
bool "970"
depends on BR2_powerpc || BR2_powerpc64
select BR2_POWERPC_CPU_HAS_ALTIVEC
config BR2_powerpc_8540
bool "8540 / e500v1"
@ -125,17 +124,17 @@ config BR2_powerpc_e6500
select BR2_POWERPC_CPU_HAS_ALTIVEC
config BR2_powerpc_power4
bool "power4"
# No C library supports this variant on ppc64le
depends on !BR2_powerpc64le
config BR2_powerpc_power5
bool "power5"
# No C library supports this variant on ppc64le
depends on !BR2_powerpc64le
config BR2_powerpc_power6
bool "power6"
depends on BR2_powerpc || BR2_powerpc64
select BR2_POWERPC_CPU_HAS_ALTIVEC
config BR2_powerpc_power7
bool "power7"
depends on BR2_powerpc || BR2_powerpc64
select BR2_POWERPC_CPU_HAS_VSX
config BR2_powerpc_power8
bool "power8"