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arch: drop support for SH2A

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Until commit "arch/Config.in.sh: fixup MMU selection" in this series,
SH2A could either be used with BR2_USE_MMU disabled or BR2_USE_MMU
enabled.

The later made absolutely no sense, since SH2A does not have a MMU:
MMU support was introduced starting from SH3 according to
https://en.wikipedia.org/wiki/SuperH#SH-3

Also, since commit 22d5501e03 ("arch:
tidy up binary formats config"), which was merged in Buildroot
2015.05, the architecture tuple used when BR2_sh2a=y and BR2_USE_MMU
disabled is sh2a-buildroot-uclinux-uclibc, and this was already
unsupported back in the days of Buildroot 2015.08 and binutils 2.24,
causing the build to fail with:

*** BFD does not support target sh2a-buildroot-uclinux-uclibc.

just like it fails to build today with recent version of binutils.

So, this has been broken since 2015.08, and nobody complained. SH2A is
seldom used, so it's time to kill it.

It is worth mentioning that there had been an attempt at resurrecting
SH2 support around 2015 (see https://lwn.net/Articles/647636/) as part
of the J2 core. This effort led to the addition of FDPIC support for
SH2A in the musl C library (and therefore proper ELF binaries, with
shared libraries), but that was never supported in Buildroot. Now that
the J2 project is essentially dead, there is no reason to bother with
this.

Fixes:

  http://autobuild.buildroot.net/results/63d01d33ae30f86b63b9f42a9fea116f2f3e9005/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 04ea3d38dd)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni
2022-04-19 23:34:48 +02:00
committed by Peter Korsgaard
parent 0c787c7955
commit 8148806995
5 changed files with 12 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/Config.in.sh
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@@ -5,8 +5,6 @@ choice
help
Specific CPU variant to use
config BR2_sh2a
bool "sh2a (SH2A big endian)"
config BR2_sh4
bool "sh4 (SH4 little endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
@@ -22,7 +20,6 @@ config BR2_sh4aeb
endchoice
config BR2_ARCH
default "sh2a" if BR2_sh2a
default "sh4" if BR2_sh4
default "sh4eb" if BR2_sh4eb
default "sh4a" if BR2_sh4a
@@ -33,7 +30,7 @@ config BR2_NORMALIZED_ARCH
config BR2_ENDIAN
default "LITTLE" if BR2_sh4 || BR2_sh4a
default "BIG" if BR2_sh2a || BR2_sh4eb || BR2_sh4aeb
default "BIG" if BR2_sh4eb || BR2_sh4aeb
config BR2_READELF_ARCH_NAME
default "Renesas / SuperH SH"