riscv/freedom-u-sdk
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Allow users to set the ISA and ABI of the target machine

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While this is an SDK for the Freedom U platform, which right now is
RV64GC only, it's also where I've been pointing people who want to build
Linux and a userspace.  This patch allows users to change the ISA and
ABI of the target.

Most of the testing effort has been targeted towards RV64GC, but I think
it's good to let people try other targets (and then hopefully fix them
:)).
This commit is contained in:
Palmer Dabbelt 2017-11-15 08:08:49 -08:00
parent 9a44dcdb1e
commit 2bd49f3e12
1 changed files with 20 additions and 3 deletions
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23
Makefile
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@ -1,5 +1,7 @@
RISCV ?= $(CURDIR)/toolchain
PATH := $(RISCV)/bin:$(PATH)
ISA ?= rv64imafdc
ABI ?= lp64d
srcdir := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
srcdir := $(srcdir:/=)
@ -43,13 +45,17 @@ target := riscv64-unknown-linux-gnu
.PHONY: all
all: $(hex)
@echo
@echo This image has been generated for an ISA of $(ISA) and an ABI of $(ABI)
@echo Find the SD-card image in work/bbl.bin
@echo Program it with: dd if=work/bbl.bin of=/dev/sd-your-card bs=1M
@echo
$(toolchain_dest)/bin/$(target)-gcc: $(toolchain_srcdir)
mkdir -p $(toolchain_wrkdir)
cd $(toolchain_wrkdir); $(toolchain_srcdir)/configure --prefix=$(toolchain_dest)
cd $(toolchain_wrkdir); $(toolchain_srcdir)/configure \
--prefix=$(toolchain_dest) \
--with-isa=$(ISA) \
--with-abi=$(ABI)
$(MAKE) -C $(toolchain_wrkdir) linux
sed 's/^#define LINUX_VERSION_CODE.*/#define LINUX_VERSION_CODE 263682/' -i $(toolchain_dest)/sysroot/usr/include/linux/version.h
@ -70,6 +76,17 @@ $(linux_wrkdir)/.config: $(linux_defconfig) $(linux_srcdir)
mkdir -p $(dir $@)
cp -p $< $@
$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
echo $(ISA)
echo $(filter rv32%,$(ISA))
ifeq (,$(filter rv%c,$(ISA)))
sed 's/^.*CONFIG_RISCV_ISA_C.*$$/CONFIG_RISCV_ISA_C=n/' -i $@
$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
endif
ifeq ($(ISA),$(filter rv32%,$(ISA)))
sed 's/^.*CONFIG_ARCH_RV32I.*$$/CONFIG_ARCH_RV32I=y/' -i $@
sed 's/^.*CONFIG_ARCH_RV64I.*$$/CONFIG_ARCH_RV64I=n/' -i $@
$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
endif
$(vmlinux): $(linux_srcdir) $(linux_wrkdir)/.config $(sysroot_stamp)
$(MAKE) -C $< O=$(linux_wrkdir) \
@ -94,7 +111,7 @@ $(bbl): $(pk_srcdir) $(vmlinux_stripped)
--with-payload=$(vmlinux_stripped) \
--enable-logo \
--with-logo=$(abspath conf/sifive_logo.txt)
CFLAGS="-mabi=lp64d -march=rv64imafdc" $(MAKE) -C $(pk_wrkdir)
CFLAGS="-mabi=$(ABI) -march=$(ISA)" $(MAKE) -C $(pk_wrkdir)
$(bin): $(bbl)
$(target)-objcopy -S -O binary --change-addresses -0x80000000 $< $@
@ -134,4 +151,4 @@ clean:
.PHONY: sim
sim: $(spike) $(bbl)
$(spike) -p4 $(bbl)
$(spike) --isa=$(ISA) -p4 $(bbl)