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efi_loader: efi_load_initrd: provide a memory mapped initrd

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U-Boot can pass an initrd to subsequent boot stages via the
EFI_LOAD_FILE2_PROTOCOL. The current implementation only supports
this functionality via the efi boot manager: the initrd is taken
from the load options of the BootCurrent variable. This commit adds
support for registering a memory mapped initrd, e.g. loaded from a
FIT image. For now this new method takes precedence over loading the
initrd from the BootCurrent variable (if both are present) because
the BootCurrent variable is not cleared on exiting the boot manager.

Signed-off-by: Adriano Cordova <adriano.cordova@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Adriano Cordova
2025-03-19 11:44:59 -03:00
committed by Heinrich Schuchardt
parent e8660b23f4
commit 73c9a35270
3 changed files with 62 additions and 13 deletions
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include/efi_loader.h
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@@ -667,7 +667,7 @@ efi_status_t efi_http_register(const efi_handle_t handle,
struct efi_service_binding_protocol *http_service_binding);
/* Called by bootefi to make the watchdog available */
efi_status_t efi_watchdog_register(void);
efi_status_t efi_initrd_register(void);
efi_status_t efi_initrd_register(struct efi_device_path *dp_initrd);
efi_status_t efi_initrd_deregister(void);
/* Called by bootefi to make SMBIOS tables available */
/**