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-rw-r--r--common/cmd_pxe.c39
-rw-r--r--doc/README.pxe14
2 files changed, 48 insertions, 5 deletions
diff --git a/common/cmd_pxe.c b/common/cmd_pxe.c
index 6b31dea..ee75db9 100644
--- a/common/cmd_pxe.c
+++ b/common/cmd_pxe.c
@@ -450,6 +450,7 @@ struct pxe_label {
char *kernel;
char *append;
char *initrd;
+ char *fdt;
int attempted;
int localboot;
struct list_head list;
@@ -517,6 +518,9 @@ static void label_destroy(struct pxe_label *label)
if (label->initrd)
free(label->initrd);
+ if (label->fdt)
+ free(label->fdt);
+
free(label);
}
@@ -541,6 +545,9 @@ static void label_print(void *data)
if (label->initrd)
printf("\t\tinitrd: %s\n", label->initrd);
+
+ if (label->fdt)
+ printf("\tfdt: %s\n", label->fdt);
}
/*
@@ -628,10 +635,29 @@ static void label_boot(struct pxe_label *label)
bootm_argv[1] = getenv("kernel_addr_r");
/*
- * fdt usage is optional. If there is an fdt_addr specified, we will
- * pass it along to bootm, and adjust argc appropriately.
+ * fdt usage is optional:
+ * It handles the following scenarios. All scenarios are exclusive
+ *
+ * Scenario 1: If fdt_addr_r specified and "fdt" label is defined in
+ * pxe file, retrieve fdt blob from server. Pass fdt_addr_r to bootm,
+ * and adjust argc appropriately.
+ *
+ * Scenario 2: If there is an fdt_addr specified, pass it along to
+ * bootm, and adjust argc appropriately.
+ *
+ * Scenario 3: fdt blob is not available.
*/
- bootm_argv[3] = getenv("fdt_addr");
+ bootm_argv[3] = getenv("fdt_addr_r");
+
+ /* if fdt label is defined then get fdt from server */
+ if (bootm_argv[3] && label->fdt) {
+ if (get_relfile_envaddr(label->fdt, "fdt_addr_r") < 0) {
+ printf("Skipping %s for failure retrieving fdt\n",
+ label->name);
+ return;
+ }
+ } else
+ bootm_argv[3] = getenv("fdt_addr");
if (bootm_argv[3])
bootm_argc = 4;
@@ -658,6 +684,7 @@ enum token_type {
T_DEFAULT,
T_PROMPT,
T_INCLUDE,
+ T_FDT,
T_INVALID
};
@@ -685,6 +712,7 @@ static const struct token keywords[] = {
{"append", T_APPEND},
{"initrd", T_INITRD},
{"include", T_INCLUDE},
+ {"fdt", T_FDT},
{NULL, T_INVALID}
};
@@ -1074,6 +1102,11 @@ static int parse_label(char **c, struct pxe_menu *cfg)
err = parse_sliteral(c, &label->initrd);
break;
+ case T_FDT:
+ if (!label->fdt)
+ err = parse_sliteral(c, &label->fdt);
+ break;
+
case T_LOCALBOOT:
err = parse_integer(c, &label->localboot);
break;
diff --git a/doc/README.pxe b/doc/README.pxe
index 2bbf53d..f00f280 100644
--- a/doc/README.pxe
+++ b/doc/README.pxe
@@ -93,8 +93,13 @@ pxe boot
be passed to the bootm command to boot the kernel. These environment
variables are required to be set.
- fdt_addr - the location of a fdt blob. If this is set, it will be passed
- to bootm when booting a kernel.
+ fdt_addr_r - location in RAM at which 'pxe boot' will store the fdt blob it
+ retrieves from tftp. The retrieval is possible if 'fdt' label is defined in
+ pxe file and 'fdt_addr_r' is set. If retrieval is possible, 'fdt_addr_r'
+ will be passed to bootm command to boot the kernel.
+
+ fdt_addr - the location of a fdt blob. 'fdt_addr' will be passed to bootm
+ command if it is set and 'fdt_addr_r' is not passed to bootm command.
pxe file format
===============
@@ -156,6 +161,11 @@ initrd <path> - if this label is chosen, use tftp to retrieve the initrd
the initrd_addr_r environment variable, and that address
will be passed to bootm.
+fdt <path> - if this label is chosen, use tftp to retrieve the fdt blob
+ at <path>. it will be stored at the address indicated in
+ the fdt_addr_r environment variable, and that address will
+ be passed to bootm.
+
localboot <flag> - Run the command defined by "localcmd" in the environment.
<flag> is ignored and is only here to match the syntax of
PXELINUX config files.