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cmd, fdt: add subcommand "get" to fdt header

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store fdt header member with name <member> in U-Boot
Environment variable with name <var>.

for example to get the total length of the fdt and store
it in filesize, call:

fdt header get filesize totalsize

For membernames look into fdt header definition at
scripts/dtc/libfdt/libfdt.h

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heiko Schocher 2018-11-15 06:06:06 +01:00 committed by Simon Glass
parent b847c14243
commit 8244127db9
1 changed files with 39 additions and 1 deletions
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40
cmd/fdt.c
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@ -73,6 +73,40 @@ static int fdt_value_env_set(const void *nodep, int len, const char *var)
return 0;
}
static const char * const fdt_member_table[] = {
"magic",
"totalsize",
"off_dt_struct",
"off_dt_strings",
"off_mem_rsvmap",
"version",
"last_comp_version",
"boot_cpuid_phys",
"size_dt_strings",
"size_dt_struct",
};
static int fdt_get_header_value(int argc, char * const argv[])
{
fdt32_t *fdtp = (fdt32_t *)working_fdt;
ulong val;
int i;
if (argv[2][0] != 'g')
return CMD_RET_FAILURE;
for (i = 0; i < ARRAY_SIZE(fdt_member_table); i++) {
if (strcmp(fdt_member_table[i], argv[4]))
continue;
val = fdt32_to_cpu(fdtp[i]);
env_set_hex(argv[3], val);
return CMD_RET_SUCCESS;
}
return CMD_RET_FAILURE;
}
/*
* Flattened Device Tree command, see the help for parameter definitions.
*/
@ -491,6 +525,9 @@ static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
* Display header info
*/
} else if (argv[1][0] == 'h') {
if (argc == 5)
return fdt_get_header_value(argc, argv);
u32 version = fdt_version(working_fdt);
printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
@ -1090,7 +1127,8 @@ static char fdt_help_text[] =
"fdt set <path> <prop> [<val>] - Set <property> [to <val>]\n"
"fdt mknode <path> <node> - Create a new node after <path>\n"
"fdt rm <path> [<prop>] - Delete the node or <property>\n"
"fdt header - Display header info\n"
"fdt header [get <var> <member>] - Display header info\n"
" get - get header member <member> and store it in <var>\n"
"fdt bootcpu <id> - Set boot cpuid\n"
"fdt memory <addr> <size> - Add/Update memory node\n"
"fdt rsvmem print - Show current mem reserves\n"