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doc: update bootefi man-page

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A image_size parameter has been added to the bootefi parameter.
Describe all parameters.

Correct how the description of how the device-path in the loaded
image protocol is determined.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt 2022-04-11 21:06:13 +02:00
parent 2058983689
commit 7f97d8cddf
1 changed files with 18 additions and 3 deletions
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21
doc/usage/cmd/bootefi.rst
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@ -9,7 +9,7 @@ Synopsis
::
bootefi [image_addr] [fdt_addr]
bootefi [image_addr] [fdt_addr [image_size]]
bootefi bootmgr [fdt_addr]
bootefi hello [fdt_addr]
bootefi selftest [fdt_addr]
@ -41,13 +41,28 @@ command sequence to run a UEFI application might look like
load mmc 0:1 $kernel_addr_r /EFI/grub/grubaa64.efi
bootefi $kernel_addr_r $fdt_addr_r
The last file loaded defines the image file path in the loaded image protocol.
Hence the executable should always be loaded last.
The last UEFI binary loaded defines the image file path in the loaded image
protocol.
The value of the environment variable *bootargs* is converted from UTF-8 to
UTF-16 and passed as load options in the loaded image protocol to the UEFI
binary.
image_addr
Address of the UEFI binary.
fdt_addr
Address of the device-tree or '-'. If no address is specifiy, the
environment variable $fdt_addr is used as first fallback, the address of
U-Boot's internal device-tree $fdtcontroladdr as second fallback.
When using ACPI no device-tree shall be specified.
image_size
Size of the UEFI binary file. This argument is only needed if *image_addr*
does not match the address of the last loaded UEFI binary. In this case
a memory device path will be used as image file path in the loaded image
protocol.
Note
UEFI binaries that are contained in FIT images are launched via the
*bootm* command.