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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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6
src/include/ipxe/dhcp.h
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@@ -440,6 +440,12 @@ struct dhcp_netdev_desc {
*/
#define DHCP_EB_SAN_RETRY DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbb )
/** SAN filename
*
* This is the path of the bootloader within the SAN device.
*/
#define DHCP_EB_SAN_FILENAME DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xbc )
/** SAN drive number
*
* This is the drive number for a SAN-hooked drive. For BIOS, 0x80 is

3
src/include/ipxe/sanboot.h
View File

@@ -155,9 +155,10 @@ void san_unhook ( unsigned int drive );
* Attempt to boot from a SAN device
*
* @v drive Drive number
* @v filename Filename (or NULL to use default)
* @ret rc Return status code
*/
int san_boot ( unsigned int drive );
int san_boot ( unsigned int drive, const char *filename );
/**
* Describe SAN devices for SAN-booted operating system

2
src/include/ipxe/settings.h
View File

@@ -452,6 +452,8 @@ filename_setting __setting ( SETTING_BOOT, filename );
extern const struct setting
root_path_setting __setting ( SETTING_SANBOOT, root-path );
extern const struct setting
san_filename_setting __setting ( SETTING_SANBOOT, san-filename );
extern const struct setting
username_setting __setting ( SETTING_AUTH, username );
extern const struct setting
password_setting __setting ( SETTING_AUTH, password );

2
src/include/usr/autoboot.h
View File

@@ -32,7 +32,7 @@ extern void set_autoboot_ll_addr ( const void *ll_addr, size_t len );
extern int uriboot ( struct uri *filename, struct uri **root_paths,
unsigned int root_path_count, int drive,
unsigned int flags );
const char *san_filename, unsigned int flags );
extern struct uri *
fetch_next_server_and_filename ( struct settings *settings );
extern int netboot ( struct net_device *netdev );