[U-Boot] [PATCH v2] PXE: FDT: Add support for fdt in PXE

[Chander Kashyap]

Now DT support is becomming common for all new SoC's. Hence it is better to
have option for getting specific FDT from the remote server.

This patch adds support for new lable i.e. fdt. If fdt_addr is specified
then load fdt blob from the remote server to fdt_address.

Signed-off-by: Chander Kashyap <chander.kash...@linaro.org>
---
        Changes in v2: Removed the duplicate code.
 
 common/cmd_pxe.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/common/cmd_pxe.c b/common/cmd_pxe.c
index 6b31dea..0c81e08 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);
 }
 
 /*
@@ -633,6 +640,15 @@ static void label_boot(struct pxe_label *label)
         */
        bootm_argv[3] = getenv("fdt_addr");
 
+       /* if fdt label is defined then get fdt from server */
+       if (bootm_argv[3] && label->fdt) {
+               if (get_relfile_envaddr(label->fdt, "fdt_addr") < 0) {
+                       printf("Skipping %s for failure retrieving fdt\n",
+                                       label->name);
+                       return;
+               }
+       }
+
        if (bootm_argv[3])
                bootm_argc = 4;
 
@@ -658,6 +674,7 @@ enum token_type {
        T_DEFAULT,
        T_PROMPT,
        T_INCLUDE,
+       T_FDT,
        T_INVALID
 };
 
@@ -685,6 +702,7 @@ static const struct token keywords[] = {
        {"append", T_APPEND},
        {"initrd", T_INITRD},
        {"include", T_INCLUDE},
+       {"fdt", T_FDT},
        {NULL, T_INVALID}
 };
 
@@ -1074,6 +1092,11 @@ 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;
-- 
1.7.9.5

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