mb/emulation/qemu-riscv: Change to -bios option

This changes the virt target so that it can be run with the -bios option
and a pflash backend for the flash. QEMU can now be run as follows:

qemu -M virt -m 1G -nographic -bios build/coreboot.rom \
        -drive if=pflash,file=./build/coreboot.rom,format=raw

coreboot will start in DRAM, but still have a flash to put CBFS onto and
to load subsequent stages and payload from.

Tested bootflow:
coreboot -> OpenSBI -> Linux -> u-root

Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: I009d97fa3e13068b91c604e987e50a65e525407d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80746
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: ron minnich <rminnich@gmail.com>
Reviewed-by: Philipp Hug <philipp@hug.cx>

1 files changed, 2 insertions, 5 deletions

diff --git a/src/mainboard/emulation/qemu-riscv/mainboard.c b/src/mainboard/emulation/qemu-riscv/mainboard.c
index f0f0740484..e17ce13d43 100644
--- a/src/mainboard/emulation/qemu-riscv/mainboard.c
+++ b/src/mainboard/emulation/qemu-riscv/mainboard.c
@@ -3,18 +3,15 @@
 #include <console/console.h>
 #include <device/device.h>
 #include <symbols.h>
-#include <ramdetect.h>
+#include <cbmem.h>
 
 static void mainboard_enable(struct device *dev)
 {
-	size_t dram_mb_detected;
-
 	if (!dev) {
 		die("No dev0; die\n");
 	}
 
-	dram_mb_detected = probe_ramsize((uintptr_t)_dram, CONFIG_DRAM_SIZE_MB);
-	ram_range(dev, 0, (uintptr_t)_dram, dram_mb_detected * MiB);
+	ram_from_to(dev, 0, (uintptr_t)_dram, (uintptr_t)cbmem_top());
 }
 
 struct chip_operations mainboard_ops = {