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cmd: pxe: support INITRD and FDT selection with FIT

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Since the commit d5ba6188df ("cmd: pxe_utils: Check fdtcontroladdr
in label_boot") the FDT or the FDTDIR label is required in extlinux.conf
and the fallback done by bootm command when only the device tree present
in this command parameters is no more performed when FIT is used for
kernel.

When the label FDT or FDTDIR are absent or if the device tree file is
absent, the PXE command in U-Boot uses the default U-Boot device tree
selected by fdtcontroladdr = gd->fdt_blob, it is the "Scenario 3".

With this scenario the bootm FIP fallback is no more possible with
the extlinux.conf when only "kernel" label is present and is a FIP:

  kernel <path>#<conf>[#<extra-conf[#...]]

As the U-Boot FDT is always provided in the third bootm argument,
the device tree found in FIP is not used as fallback, it was done
previously in boot_get_fdt().

This patch adds a new field kernel_label to save the full kernel label.
The FDT bootm parameters use the kernel address (to avoid to load a
second time the same FIP) and the config when this full label is reused
for "fdt" or "initrd" label.

This FIP support in extlinux.conf is restored when the "FDT" label
can be found and select the same FIP (identical file and configuration):

  kernel <path>#<conf>[#<extra-conf[#...]]
  fdt <path>#<conf>[#<extra-conf[#...]]

The patch add also this possibility for initrd.

  initrd <path>#<conf>[#<extra-conf[#...]]

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Patrick Delaunay 2022-10-28 11:01:19 +02:00 committed by Tom Rini
parent f723c2778c
commit a5dacef738
3 changed files with 24 additions and 3 deletions
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17
boot/pxe_utils.c
View file

@ -258,6 +258,7 @@ static struct pxe_label *label_create(void)
static void label_destroy(struct pxe_label *label)
{
free(label->name);
free(label->kernel_label);
free(label->kernel);
free(label->config);
free(label->append);
@ -542,9 +543,11 @@ static int label_boot(struct pxe_context *ctx, struct pxe_label *label)
kernel_addr = fit_addr;
}
if (label->initrd) {
/* For FIT, the label can be identical to kernel one */
if (label->initrd && !strcmp(label->kernel_label, label->initrd)) {
initrd_addr_str = kernel_addr;
} else if (label->initrd) {
ulong size;
if (get_relfile_envaddr(ctx, label->initrd, "ramdisk_addr_r",
&size) < 0) {
printf("Skipping %s for failure retrieving initrd\n",
@ -622,8 +625,11 @@ static int label_boot(struct pxe_context *ctx, struct pxe_label *label)
*/
bootm_argv[3] = env_get("fdt_addr_r");
/* For FIT, the label can be identical to kernel one */
if (label->fdt && !strcmp(label->kernel_label, label->fdt)) {
bootm_argv[3] = kernel_addr;
/* if fdt label is defined then get fdt from server */
if (bootm_argv[3]) {
} else if (bootm_argv[3]) {
char *fdtfile = NULL;
char *fdtfilefree = NULL;
@ -1164,6 +1170,11 @@ static int parse_label_kernel(char **c, struct pxe_label *label)
if (err < 0)
return err;
/* copy the kernel label to compare with FDT / INITRD when FIT is used */
label->kernel_label = strdup(label->kernel);
if (!label->kernel_label)
return -ENOMEM;
s = strstr(label->kernel, "#");
if (!s)
return 1;

8
doc/README.pxe
View file

@ -179,11 +179,19 @@ initrd <path> - if this label is chosen, use tftp to retrieve the initrd
at <path>. it will be stored at the address indicated in
the initrd_addr_r environment variable, and that address
will be passed to bootm.
For FIT image, the initrd can be provided with the same value than
kernel, including configuration:
<path>#<conf>[#<extra-conf[#...]]
In this case, kernel_addr_r is 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.
For FIT image, the device tree can be provided with the same value
than kernel, including configuration:
<path>#<conf>[#<extra-conf[#...]]
In this case, kernel_addr_r is passed to bootm.
devicetree <path> - if this label is chosen, use tftp to retrieve the fdt blob
at <path>. it will be stored at the address indicated in

2
include/pxe_utils.h
View file

@ -28,6 +28,7 @@
* Create these with the 'label_create' function given below.
*
* name - the name of the menu as given on the 'menu label' line.
* kernel_label - the kernel label, including FIT config if present.
* kernel - the path to the kernel file to use for this label.
* append - kernel command line to use when booting this label
* initrd - path to the initrd to use for this label.
@ -40,6 +41,7 @@ struct pxe_label {
char num[4];
char *name;
char *menu;
char *kernel_label;
char *kernel;
char *config;
char *append;