[PATCH v3] cmd: add FDT setup for bootelf by flag

[Maxim Moskalets]

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

Signed-off-by: Maxim Moskalets <maxim.moskal...@kaspersky.com>

Cc: Tom Rini <tr...@konsulko.com>
---

 cmd/elf.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/cmd/elf.c b/cmd/elf.c
index b7b9f506a5..c525618a39 100644
--- a/cmd/elf.c
+++ b/cmd/elf.c
@@ -38,6 +38,8 @@ 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[])
 {
+       struct bootm_headers img = {0};
+       unsigned long fdt_addr = 0; /* Address of the FDT */
        unsigned long addr; /* Address of the ELF image */
        unsigned long rc; /* Return value from user code */
        char *sload = NULL;
@@ -46,13 +48,23 @@ 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++;
        }
+
+       /* 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;
+       }
+
        /* Check for address. */
        if (argc >= 1 && strict_strtoul(argv[0], 16, &addr) != -EINVAL) {
                /* Consume address */
@@ -68,6 +80,14 @@ int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, 
char *const argv[])
        else
                addr = load_elf_image_shdr(addr);
 
+       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;
+       }
+
        if (!env_get_autostart())
                return rcode;
 
@@ -298,7 +318,7 @@ 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] [-d fdt_addr_r] [address]\n"
        "\t- load ELF image at [address] via program headers (-p)\n"
        "\t  or via section headers (-s)"
 );
-- 
2.39.2