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hw/riscv: Allow direct start of kernel for MPFS

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Further customize the -bios and -kernel options behaviour for the
microchip-icicle-kit machine.  If "-bios none -kernel filename" is
specified, then do not load a firmware and instead only load and start
the kernel image.

For test runs, use an approach similar to
riscv_find_and_load_firmware().

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250319061342.26435-5-sebastian.huber@embedded-brains.de>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Sebastian Huber 2025-03-19 07:13:36 +01:00 • committed by Alistair Francis
parent 0c2ca9e4d1
commit 6dd6f11710
1 changed files with 42 additions and 17 deletions
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59
hw/riscv/microchip_pfsoc.c
View file

@ -578,29 +578,47 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
}
/*
* We follow the following table to select which payload we execute.
* We follow the following table to select which firmware we use.
*
* -bios | -kernel | payload
* -------+------------+--------
* N | N | HSS
* Y | don't care | HSS
* N | Y | kernel
*
* This ensures backwards compatibility with how we used to expose -bios
* to users but allows them to run through direct kernel booting as well.
* -bios | -kernel | firmware
* --------------+------------+--------
* none | N | error
* none | Y | kernel
* NULL, default | N | BIOS_FILENAME
* NULL, default | Y | RISCV64_BIOS_BIN
* other | don't care | other
*/
if (machine->firmware && !strcmp(machine->firmware, "none")) {
if (!machine->kernel_filename) {
error_report("for -bios none, a kernel is required");
exit(1);
}
if (machine->kernel_filename) {
firmware_name = RISCV64_BIOS_BIN;
firmware_load_addr = memmap[MICROCHIP_PFSOC_DRAM_LO].base;
firmware_name = NULL;
firmware_load_addr = RESET_VECTOR;
} else if (!machine->firmware || !strcmp(machine->firmware, "default")) {
if (machine->kernel_filename) {
firmware_name = RISCV64_BIOS_BIN;
firmware_load_addr = memmap[MICROCHIP_PFSOC_DRAM_LO].base;
} else {
firmware_name = BIOS_FILENAME;
firmware_load_addr = RESET_VECTOR;
}
} else {
firmware_name = BIOS_FILENAME;
firmware_name = machine->firmware;
firmware_load_addr = RESET_VECTOR;
}
/* Load the firmware */
firmware_end_addr = riscv_find_and_load_firmware(machine, firmware_name,
&firmware_load_addr, NULL);
/* Load the firmware if necessary */
firmware_end_addr = firmware_load_addr;
if (firmware_name) {
char *filename = riscv_find_firmware(firmware_name, NULL);
if (filename) {
firmware_end_addr = riscv_load_firmware(filename,
&firmware_load_addr, NULL);
g_free(filename);
}
}
riscv_boot_info_init(&boot_info, &s->soc.u_cpus);
if (machine->kernel_filename) {
@ -638,8 +656,15 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
fdt_load_addr = 0;
}
hwaddr start_addr;
if (firmware_name) {
start_addr = firmware_load_addr;
} else {
start_addr = kernel_entry;
}
/* Load the reset vector */
riscv_setup_rom_reset_vec(machine, &s->soc.u_cpus, firmware_load_addr,
riscv_setup_rom_reset_vec(machine, &s->soc.u_cpus, start_addr,
memmap[MICROCHIP_PFSOC_ENVM_DATA].base,
memmap[MICROCHIP_PFSOC_ENVM_DATA].size,
kernel_entry, fdt_load_addr);