diff options
Diffstat (limited to 'doc/develop')
| -rw-r--r-- | doc/develop/bloblist.rst | 4 | ||||
| -rw-r--r-- | doc/develop/uefi/uefi.rst | 34 |
2 files changed, 37 insertions, 1 deletions
diff --git a/doc/develop/bloblist.rst b/doc/develop/bloblist.rst index 81643c7674..28431039ad 100644 --- a/doc/develop/bloblist.rst +++ b/doc/develop/bloblist.rst @@ -14,6 +14,8 @@ structure defined by the code that owns it. For the design goals of bloblist, please see the comments at the top of the `bloblist.h` header file. +Bloblist is an implementation with the `Firmware Handoff`_ protocol. + Passing state through the boot process -------------------------------------- @@ -99,7 +101,7 @@ API documentation ----------------- .. kernel-doc:: include/bloblist.h - +.. _`Firmware Handoff`: https://github.com/FirmwareHandoff/firmware_handoff Simon Glass sjg@chromium.org diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst index fb16ac743a..6bc9d92285 100644 --- a/doc/develop/uefi/uefi.rst +++ b/doc/develop/uefi/uefi.rst @@ -642,6 +642,40 @@ UEFI variables. Booting according to these variables is possible via:: As of U-Boot v2020.10 UEFI variables cannot be set at runtime. The U-Boot command 'efidebug' can be used to set the variables. +UEFI HTTP Boot +~~~~~~~~~~~~~~ + +HTTP Boot provides the capability for system deployment and configuration +over the network. HTTP Boot can be activated by specifying:: + + CONFIG_EFI_HTTP_BOOT + +Enabling that will automatically select:: + + CONFIG_CMD_DNS + CONFIG_CMD_WGET + CONFIG_BLKMAP + +Set up the load option specifying the target URI:: + + efidebug boot add -u 1 netinst http://foo/bar + +When this load option is selected as boot selection, resolve the +host ip address by dns, then download the file with wget. +If the downloaded file extension is .iso or .img file, efibootmgr tries to +mount the image and boot with the default file(e.g. EFI/BOOT/BOOTAA64.EFI). +If the downloaded file is PE-COFF image, load the downloaded file and +start it. + +The current implementation tries to resolve the IP address as a host name. +If the uri is like "http://192.168.1.1/foobar", +the dns process tries to resolve the host "192.168.1.1" and it will +end up with "host not found". + +We need to preset the "httpserverip" environment variable to proceed the wget:: + + setenv httpserverip 192.168.1.1 + Executing the built in hello world application ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |