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[Qemu-devel] [PATCH] Make -kernel flag optional on ARM.
From: |
Grant Likely |
Subject: |
[Qemu-devel] [PATCH] Make -kernel flag optional on ARM. |
Date: |
Wed, 10 Jul 2013 08:33:52 +0100 |
Sometimes we want to boot the system via firmware instead of loading a
kernel into ram with the -kernel parameter. This patch makes the -kernel
parameter optional so that a bios image provided by the -pflash flag
will be executed.
For example:
qemu-system-arm -M vexpress-a15 -pflash <filename>
Note: Currently the file must be at least the size of the emulated flash
device (64M) otherwise QEMU will silently not use the data. This will be
fixed in a separate patch
This is part of the larger solution. For this to work it requires the
platform to have flash mapped or aliased to address 0 so that there is
some code for the emulator to execute.
Signed-off-by: Grant Likely <address@hidden>
Cc: Peter Maydell <address@hidden>
Cc: address@hidden
---
hw/arm/boot.c | 47 ++++++++++++++++++++++-------------------------
1 file changed, 22 insertions(+), 25 deletions(-)
diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 7c0090f..3b9e108 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -361,12 +361,6 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info
*info)
int big_endian;
QemuOpts *machine_opts;
- /* Load the kernel. */
- if (!info->kernel_filename) {
- fprintf(stderr, "Kernel image must be specified\n");
- exit(1);
- }
-
machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
if (machine_opts) {
info->dtb_filename = qemu_opt_get(machine_opts, "dtb");
@@ -403,26 +397,29 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info
*info)
info->initrd_start = info->loader_start +
MIN(info->ram_size / 2, 128 * 1024 * 1024);
- /* Assume that raw images are linux kernels, and ELF images are not. */
- kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
- NULL, NULL, big_endian, ELF_MACHINE, 1);
- entry = elf_entry;
- if (kernel_size < 0) {
- kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
- &is_linux);
- }
- if (kernel_size < 0) {
- entry = info->loader_start + KERNEL_LOAD_ADDR;
- kernel_size = load_image_targphys(info->kernel_filename, entry,
- info->ram_size - KERNEL_LOAD_ADDR);
- is_linux = 1;
- }
- if (kernel_size < 0) {
- fprintf(stderr, "qemu: could not load kernel '%s'\n",
- info->kernel_filename);
- exit(1);
+ if (info->kernel_filename) {
+ /* Assume that raw images are linux kernels, and ELF images are not.
*/
+ kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
+ NULL, NULL, big_endian, ELF_MACHINE, 1);
+ entry = elf_entry;
+ if (kernel_size < 0) {
+ kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
+ &is_linux);
+ }
+ if (kernel_size < 0) {
+ entry = info->loader_start + KERNEL_LOAD_ADDR;
+ kernel_size = load_image_targphys(info->kernel_filename, entry,
+ info->ram_size -
KERNEL_LOAD_ADDR);
+ is_linux = 1;
+ }
+ if (kernel_size < 0) {
+ fprintf(stderr, "qemu: could not load kernel '%s'\n",
+ info->kernel_filename);
+ exit(1);
+ }
+ info->entry = entry;
}
- info->entry = entry;
+
if (is_linux) {
if (info->initrd_filename) {
initrd_size = load_image_targphys(info->initrd_filename,
--
1.8.1.2
- [Qemu-devel] [PATCH] Make -kernel flag optional on ARM.,
Grant Likely <=