diff options
| -rw-r--r-- | common/cmd_pxe.c | 39 | ||||
| -rw-r--r-- | doc/README.pxe | 14 |
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. |