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malta: update MIPS64 ISA to R2

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Usage of current R1 ISA is inconsistent with the MIPS32 subtarget, little
used and has limited utility for testing.

Many distros target a minimum R2 ISA. Debian MIPS 32-bit/64-bit ports all
use MIPS R2 ISA since Stretch, for example. Fedora's MIPS arch also targets
the R2 ISA for 32-bit/64-bit.

Widely used MIPS64 platforms like Octeon are based on the MIPS R2 ISA or
later, and benefit from having a compatible test platform in OpenWRT.

While Linux does support MIPS64 R1 targets, its usefulness for development
and testing is limited. As an example, the modern Linux eBPF JIT requires
a MIPS R2 ISA or later.

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
[Refresh config and fix README]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Tony Ambardar
2020-08-13 22:11:22 -07:00
committed by Hauke Mehrtens
parent 9f9243887e
commit 1b27591ddb
6 changed files with 25 additions and 6 deletions
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include/target.mk
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@@ -198,6 +198,7 @@ ifeq ($(DUMP),1)
CPU_CFLAGS += -mno-branch-likely
CPU_CFLAGS_mips32 = -mips32 -mtune=mips32
CPU_CFLAGS_mips64 = -mips64 -mtune=mips64 -mabi=64
CPU_CFLAGS_mips64r2 = -mips64r2 -mtune=mips64r2 -mabi=64
CPU_CFLAGS_24kc = -mips32r2 -mtune=24kc
CPU_CFLAGS_74kc = -mips32r2 -mtune=74kc
CPU_CFLAGS_octeonplus = -march=octeon+ -mabi=64