From: Bin Meng <bin.m...@windriver.com>
RV32 supports 34-bit physical address hence the maximum RAM size
should be limitted. Limit the RAM size to 10 GiB, which leaves
some room for PCIe high mmio space.
Signed-off-by: Bin Meng <bin.m...@windriver.com>
---
hw/riscv/virt.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 1d05bb3ef9..4f44509360 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -590,6 +590,19 @@ static void virt_machine_init(MachineState *machine)
}
}
+ /* limit RAM size in a 32-bit system */
+ if (riscv_is_32bit(&s->soc[0])) {
+ /*
+ * Cast machine->ram_size to 64-bit for 32-bit host,
+ * to make the build on 32-bit host happy.
+ */
+ if ((uint64_t)(machine->ram_size) > 10 * GiB) {
+ /* 32-bit host won't have a chance to execute here */
+ machine->ram_size = 10 * GiB;
+ error_report("Limitting RAM size to 10 GiB");
+ }
+ }
+
/* register system main memory (actual RAM) */
memory_region_init_ram(main_mem, NULL, "riscv_virt_board.ram",
machine->ram_size, &error_fatal);
--
2.25.1
