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nios2: Add NIOS2_ARCH_REVISION to select between R1 and R2 

Allow user to select between Nios2 R1 and R2. Since R1 and R2 are
not binary compatible, we cannot have a single kernel binary and
there is no point in having DT property for discerning these two.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
hifive-unleashed-5.1
Marek Vasut 2017-04-19 13:19:00 +02:00 committed by Ley Foon Tan
parent 4b40c1c092
commit a89988a6e0
3 changed files with 13 additions and 0 deletions
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3
arch/nios2/Makefile
View File

@ -22,7 +22,10 @@ export MMU
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
KBUILD_AFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
KBUILD_CFLAGS += -pipe -D__linux__ -D__ELF__
KBUILD_CFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div)

2
arch/nios2/kernel/cpuinfo.c
View File

@ -125,12 +125,14 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_printf(m,
"CPU:\t\tNios II/%s\n"
"REV:\t\t%i\n"
"MMU:\t\t%s\n"
"FPU:\t\tnone\n"
"Clocking:\t%u.%02u MHz\n"
"BogoMips:\t%lu.%02lu\n"
"Calibration:\t%lu loops\n",
cpuinfo.cpu_impl,
CONFIG_NIOS2_ARCH_REVISION,
cpuinfo.mmu ? "present" : "none",
clockfreq / 1000000, (clockfreq / 100000) % 10,
(loops_per_jiffy * HZ) / 500000,

8
arch/nios2/platform/Kconfig.platform
View File

@ -52,6 +52,14 @@ config NIOS2_DTB_SOURCE
comment "Nios II instructions"
config NIOS2_ARCH_REVISION
int "Select Nios II architecture revision"
range 1 2
default 1
help
Select between Nios II R1 and Nios II R2 . The architectures
are binary incompatible. Default is R1 .
config NIOS2_HW_MUL_SUPPORT
bool "Enable MUL instruction"
default n