Commit d2b2ffe3 authored by Tom Rini's avatar Tom Rini

cmd_bootm.c: Add 'booti' for ARM64 Linux kernel Images

The default format for arm64 Linux kernels is the "Image" format,
described in Documentation/arm64/booting.txt.  This, along with an
optional gzip compression on top is all that is generated by default.
The Image format has a magic number within the header for verification,
a text_offset where the Image must be run from, an image_size that
includes the BSS and reserved fields.

This does not support automatic detection of a gzip compressed image.
Signed-off-by: default avatarTom Rini <>
parent 3f1b6beb
......@@ -959,6 +959,7 @@ The following options need to be configured:
CONFIG_CMD_BSP * Board specific commands
CONFIG_CMD_BOOTI * ARM64 Linux kernel Image support
CONFIG_CMD_CACHE * icache, dcache
CONFIG_CMD_CLK * clock command support
......@@ -627,3 +627,143 @@ U_BOOT_CMD(
"boot Linux zImage image from memory", bootz_help_text
#endif /* CONFIG_CMD_BOOTZ */
/* See Documentation/arm64/booting.txt in the Linux kernel */
struct Image_header {
uint32_t code0; /* Executable code */
uint32_t code1; /* Executable code */
uint64_t text_offset; /* Image load offset, LE */
uint64_t image_size; /* Effective Image size, LE */
uint64_t res1; /* reserved */
uint64_t res2; /* reserved */
uint64_t res3; /* reserved */
uint64_t res4; /* reserved */
uint32_t magic; /* Magic number */
uint32_t res5;
#define LINUX_ARM64_IMAGE_MAGIC 0x644d5241
static int booti_setup(bootm_headers_t *images)
struct Image_header *ih;
uint64_t dst;
ih = (struct Image_header *)map_sysmem(images->ep, 0);
if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) {
puts("Bad Linux ARM64 Image magic!\n");
return 1;
if (ih->image_size == 0) {
puts("Image lacks image_size field, assuming 16MiB\n");
ih->image_size = (16 << 20);
* If we are not at the correct run-time location, set the new
* correct location and then move the image there.
dst = gd->bd->bi_dram[0].start + le32_to_cpu(ih->text_offset);
if (images->ep != dst) {
void *src;
debug("Moving Image from 0x%lx to 0x%llx\n", images->ep, dst);
src = (void *)images->ep;
images->ep = dst;
memmove((void *)dst, src, le32_to_cpu(ih->image_size));
return 0;
* Image booting support
static int booti_start(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[], bootm_headers_t *images)
int ret;
struct Image_header *ih;
ret = do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START,
images, 1);
/* Setup Linux kernel Image entry point */
if (!argc) {
images->ep = load_addr;
debug("* kernel: default image load address = 0x%08lx\n",
} else {
images->ep = simple_strtoul(argv[0], NULL, 16);
debug("* kernel: cmdline image address = 0x%08lx\n",
ret = booti_setup(images);
if (ret != 0)
return 1;
ih = (struct Image_header *)map_sysmem(images->ep, 0);
lmb_reserve(&images->lmb, images->ep, le32_to_cpu(ih->image_size));
* Handle the BOOTM_STATE_FINDOTHER state ourselves as we do not
* have a header that provide this informaiton.
if (bootm_find_ramdisk_fdt(flag, argc, argv))
return 1;
return 0;
int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
int ret;
/* Consume 'booti' */
argc--; argv++;
if (booti_start(cmdtp, flag, argc, argv, &images))
return 1;
* We are doing the BOOTM_STATE_LOADOS state ourselves, so must
* disable interrupts ourselves
images.os.os = IH_OS_LINUX;
ret = do_bootm_states(cmdtp, flag, argc, argv,
&images, 1);
return ret;
static char booti_help_text[] =
"[addr [initrd[:size]] [fdt]]\n"
" - boot Linux Image stored in memory\n"
"\tThe argument 'initrd' is optional and specifies the address\n"
"\tof the initrd in memory. The optional argument ':size' allows\n"
"\tspecifying the size of RAW initrd.\n"
#if defined(CONFIG_OF_LIBFDT)
"\tSince booting a Linux kernelrequires a flat device-tree\n"
"\ta third argument is required which is the address of the\n"
"\tdevice-tree blob. To boot that kernel without an initrd image,\n"
"\tuse a '-' for the second argument.\n"
booti, CONFIG_SYS_MAXARGS, 1, do_booti,
"boot arm64 Linux Image image from memory", booti_help_text
#endif /* CONFIG_CMD_BOOTI */
......@@ -48,7 +48,7 @@ int boot_selected_os(int argc, char * const argv[], int state,
ulong bootm_disable_interrupts(void);
/* This is a special function used by bootz */
/* This is a special function used by booti/bootz */
int bootm_find_ramdisk_fdt(int flag, int argc, char * const argv[]);
int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
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