@@ -13,13 +13,29 @@ 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 +53,11 @@ 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_archs_full
choice
prompt "MMU Page Size"
@@ -60,7 +77,7 @@ 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 +87,7 @@ 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
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> --- Basically this is a slight rework of [1] with the following chnages: * No uClibc changes as we no longer mess with ARC core versions there, see [2] * Added help message so users see what is meant * Renamed internal BR variable to indicate more chnages but not only floating-point unit [1] https://patchwork.ozlabs.org/patch/786200/ [2] https://git.buildroot.org/buildroot/commit/?id=9cb6caf891588302d04baa4bbe84d672736ca502 arch/Config.in.arc | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-)