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[block] Allow use of a non-default EFI SAN boot filename

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Some older operating systems (e.g. RHEL6) use a non-default filename
on the root disk and rely on setting an EFI variable to point to the
bootloader.  This does not work when performing a SAN boot on a
machine where the EFI variable is not present.

Fix by allowing a non-default filename to be specified via the
"sanboot --filename" option or the "san-filename" setting.  For
example:

  sanboot --filename \efi\redhat\grub.efi \
          iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.demo:rhel6

or

  option ipxe.san-filename code 188 = string;
  option ipxe.san-filename "\\efi\\redhat\\grub.efi";
  option root-path "iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.demo:rhel6";

Originally-implemented-by: Vishvananda Ishaya Abrams <vish.ishaya@oracle.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-04-12 15:03:25 +01:00
parent a82f937485
commit 84d406ccf4
12 changed files with 97 additions and 21 deletions
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5
src/core/dummy_sanboot.c
View File

@@ -95,8 +95,11 @@ static void dummy_san_unhook ( unsigned int drive ) {
* Boot from dummy SAN device
*
* @v drive Drive number
* @v filename Filename (or NULL to use default)
* @ret rc Return status code
*/
static int dummy_san_boot ( unsigned int drive __unused ) {
static int dummy_san_boot ( unsigned int drive __unused,
const char *filename __unused ) {
return -EOPNOTSUPP;
}

3
src/core/null_sanboot.c
View File

@@ -37,7 +37,8 @@ static void null_san_unhook ( unsigned int drive __unused ) {
/* Do nothing */
}
static int null_san_boot ( unsigned int drive __unused ) {
static int null_san_boot ( unsigned int drive __unused,
const char *filename __unused ) {
return -EOPNOTSUPP;
}

9
src/core/settings.c
View File

@@ -2396,6 +2396,15 @@ const struct setting root_path_setting __setting ( SETTING_SANBOOT, root-path)={
.type = &setting_type_string,
};
/** SAN filename setting */
const struct setting san_filename_setting __setting ( SETTING_SANBOOT,
san-filename ) = {
.name = "san-filename",
.description = "SAN filename",
.tag = DHCP_EB_SAN_FILENAME,
.type = &setting_type_string,
};
/** Username setting */
const struct setting username_setting __setting ( SETTING_AUTH, username ) = {
.name = "username",