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>

diff --git a/arch/Config.in.arc b/arch/Config.in.arc
index 6cddbb961f3d9d2edb1516342f778aa14afdcd0b..f7818e7ebb87c02ae1d942f5d40861a05185ce28 100644 (file)
--- a/arch/Config.in.arc
+++ b/arch/Config.in.arc
@@ -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