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 <h...@denx.de>
---
cmd/fdt.c | 40 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/cmd/fdt.c b/cmd/fdt.c
index 8a19a3fdbf..cc50f7914d 100644
--- a/cmd/fdt.c
+++ b/cmd/fdt.c
@@ -73,6 +73,40 @@ static int fdt_value_env_set(const void *nodep, int len,
const char *var)
return 0;
}
+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]) == 0) {
+ val = fdt32_to_cpu(*fdtp);
+ env_set_hex(argv[3], val);
+ return CMD_RET_SUCCESS;
+ }
+ fdtp++;
+ }
+
+ 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"
--
2.13.6
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-52 Fax: +49-8142-66989-80 Email: h...@denx.de
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