baremetal-helloworld: Enable RISC-V 32 port

$ runqemu nographic
runqemu - INFO - Running bitbake -e ...
KERNEL: [tmp/deploy/images/qemuriscv32/baremetal-helloworld-image-qemuriscv32.bin]
MACHINE: [qemuriscv32]
runqemu - INFO - Running tmp/work/x86_64-linux/qemu-helper-native/1.0-r1/recipe-sysroot-native/usr/bin/qemu-system-riscv32

Hello OpenEmbedded on RISC-V 32!

(From OE-Core rev: d4cca7471f2167b56347fa7b1364bb84a200b1f5)

Signed-off-by: Alejandro Enedino Hernandez Samaniego <alejandro@enedino.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-skeleton/recipes-baremetal/baremetal-examples/baremetal-helloworld_git.bb

@@ -4,7 +4,7 @@ DESCRIPTION = "These are introductory examples to showcase the use of QEMU to ru
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=39346640a23c701e4f459e05f56f4449"
 
-SRCREV = "0bf9ea216e6f76be50726a3a74e527b7bbb0ad93"
+SRCREV = "31b4e5a337018b4a00a7426b0e5ed83b81df30c7"
 PV = "0.1+git${SRCPV}"
 
 SRC_URI = "git://github.com/aehs29/baremetal-helloqemu.git;protocol=https;branch=master"
@@ -28,13 +28,14 @@ inherit baremetal-image
 # machine that QEMU uses on OE, e.g. -machine virt -cpu cortex-a57
 # but the examples can also be run on other architectures/machines
 # such as vexpress-a15 by overriding the setting on the machine.conf
-COMPATIBLE_MACHINE = "qemuarmv5|qemuarm|qemuarm64|qemuriscv64"
+COMPATIBLE_MACHINE = "qemuarmv5|qemuarm|qemuarm64|qemuriscv64|qemuriscv32"
 
 BAREMETAL_QEMUARCH ?= ""
 BAREMETAL_QEMUARCH:qemuarmv5 = "versatile"
 BAREMETAL_QEMUARCH:qemuarm = "arm"
 BAREMETAL_QEMUARCH:qemuarm64 = "aarch64"
 BAREMETAL_QEMUARCH:qemuriscv64 = "riscv64"
+BAREMETAL_QEMUARCH:qemuriscv32 = "riscv32"
 
 EXTRA_OEMAKE:append = " QEMUARCH=${BAREMETAL_QEMUARCH} V=1"
 

meta/classes/baremetal-image.bbclass

@@ -82,12 +82,15 @@ QB_OPT_APPEND:append = " -nographic"
 # RISC-V tunes set the BIOS, unset, and instruct QEMU to
 # ignore the BIOS and boot from -kernel
 QB_DEFAULT_BIOS:qemuriscv64 = ""
+QB_DEFAULT_BIOS:qemuriscv32 = ""
 QB_OPT_APPEND:append:qemuriscv64 = " -bios none"
+QB_OPT_APPEND:append:qemuriscv32 = " -bios none"
 
 
 # Use the medium-any code model for the RISC-V 64 bit implementation,
 # since medlow can only access addresses below 0x80000000 and RAM
 # starts at 0x80000000 on RISC-V 64
+# Keep RISC-V 32 using -mcmodel=medlow (symbols lie between -2GB:2GB)
 CFLAGS:append:qemuriscv64 = " -mcmodel=medany"