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efi_loader: correct shortening of device-paths

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We use short device-paths in boot options so that a file on a block device
can be found independent of the port into which the device is plugged.

Usb() device-path nodes only contain port and interface information and
therefore cannot identify a block device.
UsbWwi() device-path nodes contain the serial number of USB devices.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt
2023-03-26 12:22:40 +02:00
parent ffc1cfb8f4
commit a9203b0fef
2 changed files with 7 additions and 15 deletions
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1
include/efi_api.h
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@@ -610,6 +610,7 @@ struct efi_device_path_acpi_path {
# define DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR 0x0b
# define DEVICE_PATH_SUB_TYPE_MSG_UART 0x0e
# define DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS 0x0f
# define DEVICE_PATH_SUB_TYPE_MSG_USB_WWI 0x10
# define DEVICE_PATH_SUB_TYPE_MSG_SATA 0x12
# define DEVICE_PATH_SUB_TYPE_MSG_NVME 0x17
# define DEVICE_PATH_SUB_TYPE_MSG_URI 0x18