x86: hob: Add way to show a single hob entry

The 'hob' command currently lists all HOB entries. Add way to list a
single entry, by index.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/cmd/x86/hob.c b/cmd/x86/hob.c
index 6b1f7bda5b82f7d7052c93574c8e65fe2a5255c2..e3f512beee88e4d9b132b4b1944900d3496d7a54 100644 (file)
--- a/cmd/x86/hob.c
+++ b/cmd/x86/hob.c
@@ -34,7 +34,12 @@ static int do_hob(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
        int i = 0;
        efi_guid_t *guid;
        char uuid[UUID_STR_LEN + 1];
+       int seq = -1;   /* Show all by default */
 
+       argc--;
+       argv++;
+       if (argc)
+               seq = simple_strtol(*argv, NULL, 16);
        hdr = gd->arch.hob_list;
 
        printf("HOB list address: 0x%08x\n\n", (unsigned int)hdr);
@@ -43,7 +48,9 @@ static int do_hob(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
        printf("%36s\n", "GUID");
        printf("---|----------|-----------|------|-");
        printf("------------------------------------\n");
-       while (!end_of_hob(hdr)) {
+       for (i = 0; !end_of_hob(hdr); i++, hdr = get_next_hob(hdr)) {
+               if (seq != -1 && seq != i)
+                       continue;
                printf("%02x | %08x | ", i, (unsigned int)hdr);
                type = hdr->type;
                if (type == HOB_TYPE_UNUSED)
@@ -65,14 +72,13 @@ static int do_hob(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
                        printf("%36s", "Not Available");
                }
                printf("\n");
-               hdr = get_next_hob(hdr);
-               i++;
        }
 
        return 0;
 }
 
-U_BOOT_CMD(hob, 1, 1, do_hob,
-          "Print Hand-Off Block (HOB) information",
+U_BOOT_CMD(hob, 2, 1, do_hob,
+          "[seq]  Print Hand-Off Block (HOB) information"
+          "   seq - Record # to show (all by default)",
           ""
 );