roms: Add virtual Boot ROM for NPCM7xx SoCs

This is a minimalistic boot ROM written specifically for use with QEMU.
It supports loading the second-stage loader from SPI flash into RAM, SMP
boot, and not much else.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Message-id: 20200911052101.2602693-7-hskinnemoen@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

.gitmodules

@@ -61,3 +61,6 @@
 [submodule "meson"]
 	path = meson
 	url = https://github.com/mesonbuild/meson/
+[submodule "roms/vbootrom"]
+	path = roms/vbootrom
+	url = https://github.com/google/vbootrom.git

MAINTAINERS

@@ -757,6 +757,8 @@ L: qemu-arm@nongnu.org
 S: Supported
 F: hw/*/npcm7xx*
 F: include/hw/*/npcm7xx*
+F: pc-bios/npcm7xx_bootrom.bin
+F: roms/vbootrom
 
 nSeries
 M: Andrzej Zaborowski <balrogg@gmail.com>

pc-bios/README

@@ -71,3 +71,9 @@
   ("Simplified BSD License" or "FreeBSD License", SPDX: BSD-2-Clause). OpenSBI
   source code also contains code reused from other projects desribed here:
   https://github.com/riscv/opensbi/blob/master/ThirdPartyNotices.md.
+
+- npcm7xx_bootrom.bin is a simplified, free (Apache 2.0) boot ROM for Nuvoton
+  NPCM7xx BMC devices. It currently implements the bare minimum to load, parse,
+  initialize and run boot images stored in SPI flash, but may grow more
+  features over time as needed. The source code is available at:
+  https://github.com/google/vbootrom

pc-bios/meson.build

@@ -81,6 +81,7 @@ blobs = files(
   'opensbi-riscv64-generic-fw_dynamic.bin',
   'opensbi-riscv32-generic-fw_dynamic.elf',
   'opensbi-riscv64-generic-fw_dynamic.elf',
+  'npcm7xx_bootrom.bin',
 )
 
 if install_blobs

roms/Makefile

@@ -34,6 +34,7 @@ find-cross-gcc = $(firstword $(wildcard $(patsubst %ld,%gcc,$(call find-cross-ld
 # finally strip off path + toolname so we get the prefix
 find-cross-prefix = $(subst gcc,,$(notdir $(call find-cross-gcc,$(1))))
 
+arm_cross_prefix := $(call find-cross-prefix,arm)
 powerpc64_cross_prefix := $(call find-cross-prefix,powerpc64)
 powerpc_cross_prefix := $(call find-cross-prefix,powerpc)
 x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
@@ -63,6 +64,7 @@ default help:
 	@echo "  skiboot            -- update skiboot.lid"
 	@echo "  u-boot.e500        -- update u-boot.e500"
 	@echo "  u-boot.sam460      -- update u-boot.sam460"
+	@echo "  npcm7xx_bootrom    -- update vbootrom for npcm7xx"
 	@echo "  efi                -- update UEFI (edk2) platform firmware"
 	@echo "  opensbi32-generic  -- update OpenSBI for 32-bit generic machine"
 	@echo "  opensbi64-generic  -- update OpenSBI for 64-bit generic machine"
@@ -185,6 +187,10 @@ bios-microvm:
 	$(MAKE) -C qboot
 	cp qboot/bios.bin ../pc-bios/bios-microvm.bin
 
+npcm7xx_bootrom:
+	$(MAKE) -C vbootrom CROSS_COMPILE=$(arm_cross_prefix)
+	cp vbootrom/npcm7xx_bootrom.bin ../pc-bios/npcm7xx_bootrom.bin
+
 clean:
 	rm -rf seabios/.config seabios/out seabios/builds
 	$(MAKE) -C sgabios clean
@@ -198,3 +204,4 @@ clean:
 	$(MAKE) -f Makefile.edk2 clean
 	$(MAKE) -C opensbi clean
 	$(MAKE) -C qboot clean
+	$(MAKE) -C vbootrom clean