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boot: pxe_utils: Add extension board devicetree overlay support

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Add support for scanning and applying extension board devicetree
overlays during PXE boot. After loading the main board devicetree,
the system now scans for available extension boards and applies their
overlays automatically.

This enables dynamic hardware configuration for systems with extension
boards during boot scenarios which are using pxe_utils.

Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Kory Maincent (TI.com)
2025-10-30 17:45:11 +01:00
committed by Tom Rini
parent f9b139342c
commit 935109cd9e
2 changed files with 96 additions and 0 deletions
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92
boot/pxe_utils.c
View File

@@ -10,6 +10,7 @@
#include <command.h>
#include <dm.h>
#include <env.h>
#include <extension_board.h>
#include <image.h>
#include <log.h>
#include <malloc.h>
@@ -432,6 +433,95 @@ skip_overlay:
}
#endif
/*
* label_boot_extension - scan extension boards and load overlay associated
*/
static void label_boot_extension(struct pxe_context *ctx,
struct pxe_label *label)
{
#if CONFIG_IS_ENABLED(SUPPORT_EXTENSION_SCAN)
const struct extension *extension;
struct fdt_header *working_fdt;
struct alist *extension_list;
int ret, dir_len, len;
char *overlay_dir;
const char *slash;
ulong fdt_addr;
ret = extension_scan();
if (ret < 0)
return;
extension_list = extension_get_list();
if (!extension_list)
return;
/* Get the main fdt and map it */
fdt_addr = env_get_hex("fdt_addr_r", 0);
working_fdt = map_sysmem(fdt_addr, 0);
if (fdt_check_header(working_fdt))
return;
/* Use fdtdir for now as the overlay devicetree directory */
if (label->fdtdir) {
len = strlen(label->fdtdir);
if (!len)
slash = "./";
else if (label->fdtdir[len - 1] != '/')
slash = "/";
else
slash = "";
dir_len = strlen(label->fdtdir) + strlen(slash) + 1;
overlay_dir = calloc(1, len);
if (!overlay_dir)
return;
snprintf(overlay_dir, dir_len, "%s%s", label->fdtdir,
slash);
} else {
dir_len = 2;
snprintf(overlay_dir, dir_len, "/");
}
alist_for_each(extension, extension_list) {
char *overlay_file;
ulong size;
len = dir_len + strlen(extension->overlay);
overlay_file = calloc(1, len);
if (!overlay_file)
goto cleanup;
snprintf(overlay_file, len, "%s%s", overlay_dir,
extension->overlay);
/* Load extension overlay file */
ret = get_relfile_envaddr(ctx, overlay_file,
"extension_overlay_addr",
(enum bootflow_img_t)IH_TYPE_FLATDT,
&size);
if (ret < 0) {
printf("Failed loading overlay %s\n", overlay_file);
free(overlay_file);
continue;
}
ret = extension_apply(working_fdt, size);
if (ret) {
printf("Failed applying overlay %s\n", overlay_file);
free(overlay_file);
continue;
}
free(overlay_file);
}
cleanup:
free(overlay_dir);
#endif
}
/**
* label_boot() - Boot according to the contents of a pxe_label
*
@@ -685,6 +775,8 @@ static int label_boot(struct pxe_context *ctx, struct pxe_label *label)
if (label->fdtoverlays)
label_boot_fdtoverlay(ctx, label);
#endif
label_boot_extension(ctx, label);
} else {
bootm_argv[3] = NULL;
}

4
doc/usage/pxe.rst
View File

@@ -103,6 +103,10 @@ Environment
``fdt_addr_r``. Required to use the ``fdtoverlays`` command in
the PXE file.
``extension_overlay_addr``
Location in RAM to temporarily store extension fdt overlay(s)
before applying them to the fdt blob stored at ``fdt_addr_r``.
``pxe_label_override``
Override label to be used, if exists, instead of the default
label. This will allow consumers to choose a pxe label at