diff mbox series

[v3,4/6] hw/riscv: Allow direct start of kernel for MPFS

Message ID 20250319061342.26435-5-sebastian.huber@embedded-brains.de (mailing list archive)
State New
Headers show
Series Improve Microchip Polarfire SoC customization | expand

Commit Message

Sebastian Huber March 19, 2025, 6:13 a.m. UTC 
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>
---
 hw/riscv/microchip_pfsoc.c | 59 +++++++++++++++++++++++++++-----------
 1 file changed, 42 insertions(+), 17 deletions(-)

Comments

Alistair Francis April 4, 2025, 2 a.m. UTC | #1 
On Wed, Mar 19, 2025 at 4:13 PM Sebastian Huber
<sebastian.huber@embedded-brains.de> wrote:
>
> 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>

Alistair

> ---
>  hw/riscv/microchip_pfsoc.c | 59 +++++++++++++++++++++++++++-----------
>  1 file changed, 42 insertions(+), 17 deletions(-)
>
> diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c
> index 844dc0545c..5c9f7f643f 100644
> --- a/hw/riscv/microchip_pfsoc.c
> +++ b/hw/riscv/microchip_pfsoc.c
> @@ -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);
> --
> 2.43.0
>
diff mbox series

Patch

diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c
index 844dc0545c..5c9f7f643f 100644
--- a/hw/riscv/microchip_pfsoc.c
+++ b/hw/riscv/microchip_pfsoc.c
@@ -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);