hw/riscv: More flexible FDT placement for MPFS

If the kernel entry is in the high DRAM area, place the FDT into this
area.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250319061342.26435-3-sebastian.huber@embedded-brains.de>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c
index e39ee657cd0d4eb28563a2613e4c9113ef23a461..6bb44e3ac5e9e3287fb22caf759e9d0cfe44eecf 100644 (file)
--- a/hw/riscv/microchip_pfsoc.c
+++ b/hw/riscv/microchip_pfsoc.c
@@ -626,8 +626,15 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
         kernel_entry = boot_info.image_low_addr;
 
         /* Compute the fdt load address in dram */
-        fdt_load_addr = riscv_compute_fdt_addr(memmap[MICROCHIP_PFSOC_DRAM_LO].base,
-                                               memmap[MICROCHIP_PFSOC_DRAM_LO].size,
+        hwaddr kernel_ram_base = memmap[MICROCHIP_PFSOC_DRAM_LO].base;
+        hwaddr kernel_ram_size = memmap[MICROCHIP_PFSOC_DRAM_LO].size;
+
+        if (kernel_entry - kernel_ram_base >= kernel_ram_size) {
+            kernel_ram_base = memmap[MICROCHIP_PFSOC_DRAM_HI].base;
+            kernel_ram_size = mem_high_size;
+        }
+
+        fdt_load_addr = riscv_compute_fdt_addr(kernel_ram_base, kernel_ram_size,
                                                machine, &boot_info);
         riscv_load_fdt(fdt_load_addr, machine->fdt);