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hw/riscv: Make FDT optional for MPFS

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Real-time kernels such as RTEMS or Zephyr may use a static device tree
built into the kernel image.  Do not require to use the -dtb option if
-kernel is used for the microchip-icicle-kit machine.  Issue a warning
if no device tree is provided by the user since the machine does not
generate one.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250319061342.26435-4-sebastian.huber@embedded-brains.de>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Sebastian Huber 2025-03-19 07:13:35 +01:00 • committed by Alistair Francis
parent cae44a92ab
commit 0c2ca9e4d1
1 changed files with 27 additions and 27 deletions
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54
hw/riscv/microchip_pfsoc.c
View file

@ -516,7 +516,6 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
uint64_t mem_low_size, mem_high_size;
hwaddr firmware_load_addr;
const char *firmware_name;
bool kernel_as_payload = false;
target_ulong firmware_end_addr, kernel_start_addr;
uint64_t kernel_entry;
uint64_t fdt_load_addr;
@ -589,25 +588,12 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
*
* This ensures backwards compatibility with how we used to expose -bios
* to users but allows them to run through direct kernel booting as well.
*
* When -kernel is used for direct boot, -dtb must be present to provide
* a valid device tree for the board, as we don't generate device tree.
*/
if (machine->kernel_filename && machine->dtb) {
int fdt_size;
machine->fdt = load_device_tree(machine->dtb, &fdt_size);
if (!machine->fdt) {
error_report("load_device_tree() failed");
exit(1);
}
if (machine->kernel_filename) {
firmware_name = RISCV64_BIOS_BIN;
firmware_load_addr = memmap[MICROCHIP_PFSOC_DRAM_LO].base;
kernel_as_payload = true;
}
if (!kernel_as_payload) {
} else {
firmware_name = BIOS_FILENAME;
firmware_load_addr = RESET_VECTOR;
}
@ -617,7 +603,7 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
&firmware_load_addr, NULL);
riscv_boot_info_init(&boot_info, &s->soc.u_cpus);
if (kernel_as_payload) {
if (machine->kernel_filename) {
kernel_start_addr = riscv_calc_kernel_start_addr(&boot_info,
firmware_end_addr);
@ -625,19 +611,33 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
true, NULL);
kernel_entry = boot_info.image_low_addr;
/* Compute the fdt load address in dram */
hwaddr kernel_ram_base = memmap[MICROCHIP_PFSOC_DRAM_LO].base;
hwaddr kernel_ram_size = memmap[MICROCHIP_PFSOC_DRAM_LO].size;
if (machine->dtb) {
int fdt_size;
machine->fdt = load_device_tree(machine->dtb, &fdt_size);
if (!machine->fdt) {
error_report("load_device_tree() failed");
exit(1);
}
if (kernel_entry - kernel_ram_base >= kernel_ram_size) {
kernel_ram_base = memmap[MICROCHIP_PFSOC_DRAM_HI].base;
kernel_ram_size = mem_high_size;
/* Compute the FDT load address in DRAM */
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);
} else {
warn_report_once("The QEMU microchip-icicle-kit machine does not "
"generate a device tree, so no device tree is "
"being provided to the guest.");
fdt_load_addr = 0;
}
fdt_load_addr = riscv_compute_fdt_addr(kernel_ram_base, kernel_ram_size,
machine, &boot_info);
riscv_load_fdt(fdt_load_addr, machine->fdt);
/* Load the reset vector */
riscv_setup_rom_reset_vec(machine, &s->soc.u_cpus, firmware_load_addr,
memmap[MICROCHIP_PFSOC_ENVM_DATA].base,