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ARC: Add support for ARC HS38 with Quad MAC & FPU 

We used to build everything for pretty much baseline ARC HS capable
of runnig Linux kernel, which was ARC HS38/48 with MMU and caches.

But there's a fully featured ARC HS with additional support for
 - Dual & quad integer multiply and MAC operations
 - Double-precision floating-point unit

It corresponds to the following ARC HS templates in ARChitect: hs38_slc_full.

In fact existing HSDK board uses exactly this configuration in its SoC
and this is recommended configuration for Linux use-cases.

To make life simpler we have corresponding "-mcpu" and "--with-cpu"
options in ARC GCC port so we're going to use it and get binaries
built accordingly optimized.

And while at it added help message so users may better understand
what they are dealing with.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
2019.08.x
Alexey Brodkin 2018-11-08 16:59:40 -05:00 committed by Arnout Vandecappelle (Essensium/Mind)
parent b6a06140cd
commit a0835675ae
1 changed files with 22 additions and 4 deletions
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26
arch/Config.in.arc
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@ -13,13 +13,30 @@ config BR2_arc770d
config BR2_archs38
bool "ARC HS38"
help
Generic ARC HS capable of running Linux, i.e. with MMU,
caches and multiplier. Also it corresponds to the default
configuration in older GNU toolchain versions.
If you're not sure which version of ARC HS core you build for
keep this one.
config BR2_archs38_full
bool "ARC HS38 with Quad MAC & FPU"
help
Fully featured ARC HS with additional support for
- Dual- and quad multiply and MC oprations
- Double-precision FPU
It corresponds to "hs38_slc_full" ARC HS template in
ARChitect.
endchoice
# Choice of atomic instructions presence
config BR2_ARC_ATOMIC_EXT
bool "Atomic extension (LLOCK/SCOND instructions)"
default y if BR2_arc770d || BR2_archs38
default y if BR2_arc770d || BR2_archs38 || BR2_archs38_full
config BR2_ARCH
default "arc" if BR2_arcle
@ -37,10 +54,11 @@ config BR2_GCC_TARGET_CPU
default "arc700" if BR2_arc750d
default "arc700" if BR2_arc770d
default "archs" if BR2_archs38
default "hs38_linux" if BR2_archs38_full
config BR2_READELF_ARCH_NAME
default "ARCompact" if BR2_arc750d || BR2_arc770d
default "ARCv2" if BR2_archs38
default "ARCv2" if BR2_archs38 || BR2_archs38_full
choice
prompt "MMU Page Size"
@ -60,7 +78,7 @@ choice
config BR2_ARC_PAGE_SIZE_4K
bool "4KB"
depends on BR2_arc770d || BR2_archs38
depends on BR2_arc770d || BR2_archs38 || BR2_archs38_full
config BR2_ARC_PAGE_SIZE_8K
bool "8KB"
@ -70,7 +88,7 @@ config BR2_ARC_PAGE_SIZE_8K
config BR2_ARC_PAGE_SIZE_16K
bool "16KB"
depends on BR2_arc770d || BR2_archs38
depends on BR2_arc770d || BR2_archs38 || BR2_archs38_full
endchoice