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cmd: add FDT setup for bootelf by flag

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Added the ability to use FDT for ELF applications, required to run some
OS. To make FDT setup, you need to set the -d fdt_addr_r cmd option for
bootelf command. Enable by selecting CMD_ELF_FDT_SETUP.

Signed-off-by: Maxim Moskalets <Maxim.Moskalets@kaspersky.com>
This commit is contained in:
Maxim Moskalets 2024-03-08 00:29:14 +03:00 • committed by Tom Rini
parent f56d9a385c
commit 6d1734f005
2 changed files with 47 additions and 3 deletions
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11
cmd/Kconfig
View file

@ -490,6 +490,17 @@ config CMD_ELF
help
Boot an ELF/vxWorks image from the memory.
config CMD_ELF_FDT_SETUP
bool "Flattened Device Tree setup in bootelf cmd"
default n
depends on CMD_ELF
select LIB_LIBFDT
select LMB
help
Do FDT setup in bootelf command optionally by param -d, which
allows to bring additional system info (e.g. /memory node) to
the Operating System or application.
config CMD_FDT
bool "Flattened Device Tree utility commands"
default y

39
cmd/elf.c
View file

@ -38,6 +38,10 @@ static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
/* Interpreter command to boot an arbitrary ELF image from memory */
int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
#if CONFIG_IS_ENABLED(CMD_ELF_FDT_SETUP)
struct bootm_headers img = {0};
unsigned long fdt_addr = 0; /* Address of the FDT */
#endif
unsigned long addr; /* Address of the ELF image */
unsigned long rc; /* Return value from user code */
char *sload = NULL;
@ -46,13 +50,25 @@ int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
/* Consume 'bootelf' */
argc--; argv++;
/* Check for flag. */
/* Check for [-p|-s] flag. */
if (argc >= 1 && (argv[0][0] == '-' && \
(argv[0][1] == 'p' || argv[0][1] == 's'))) {
sload = argv[0];
/* Consume flag. */
argc--; argv++;
}
#if CONFIG_IS_ENABLED(CMD_ELF_FDT_SETUP)
/* Check for [-d fdt_addr_r] option. */
if ((argc >= 2) && (argv[0][0] == '-') && (argv[0][1] == 'd')) {
if (strict_strtoul(argv[1], 16, &fdt_addr) != 0)
return CMD_RET_USAGE;
/* Consume option. */
argc -= 2;
argv += 2;
}
#endif
/* Check for address. */
if (argc >= 1 && strict_strtoul(argv[0], 16, &addr) != -EINVAL) {
/* Consume address */
@ -68,6 +84,16 @@ int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
else
addr = load_elf_image_shdr(addr);
#if CONFIG_IS_ENABLED(CMD_ELF_FDT_SETUP)
if (fdt_addr) {
printf("## Setting up FDT at 0x%08lx ...\n", fdt_addr);
flush();
if (image_setup_libfdt(&img, (void *)fdt_addr, NULL))
return 1;
}
#endif
if (!env_get_autostart())
return rcode;
@ -298,9 +324,16 @@ int do_bootvx(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
U_BOOT_CMD(
bootelf, CONFIG_SYS_MAXARGS, 0, do_bootelf,
"Boot from an ELF image in memory",
"[-p|-s] [address]\n"
"[-p|-s] "
#if CONFIG_IS_ENABLED(CMD_ELF_FDT_SETUP)
"[-d fdt_addr_r] "
#endif
"[address]\n"
"\t- load ELF image at [address] via program headers (-p)\n"
"\t or via section headers (-s)"
"\t or via section headers (-s)\n"
#if CONFIG_IS_ENABLED(CMD_ELF_FDT_SETUP)
"\t- setup FDT image at [fdt_addr_r] (-d)"
#endif
);
U_BOOT_CMD(