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efi_loader: Remove unconditional installation of file2 protocol for initrd

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Up to now we install the EFI_LOAD_FILE2_PROTOCOL to load an initrd
unconditionally. Although we correctly return various EFI exit codes
depending on the file status (i.e EFI_NO_MEDIA, EFI_NOT_FOUND etc), the
kernel loader only falls back to the cmdline interpreted initrd if the
protocol is not installed.

This creates a problem for EFI installers, since they won't be able to
load their own initrd and start the installation.

A following patch introduces a different logic where we search for an
initrd path defined in an EFI variable named 'Initrd####'.
If the bootmgr is used to launch the EFI payload, we'll will try to match
the BootCurrent value and find the corresponding initrd
(i.e Boot0000 -> Initrd0000 etc). If the file is found, we'll install
the required protocol which the kernel's efi-stub can use and load our
initrd.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Ilias Apalodimas 2020-12-30 17:07:14 +02:00 committed by Heinrich Schuchardt
parent 0c44452832
commit 47d2b3b9c9
1 changed files with 0 additions and 5 deletions
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5
lib/efi_loader/efi_setup.c
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@ -257,11 +257,6 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;
#endif
#ifdef CONFIG_EFI_LOAD_FILE2_INITRD
ret = efi_initrd_register();
if (ret != EFI_SUCCESS)
goto out;
#endif
#ifdef CONFIG_NET
ret = efi_net_register();
if (ret != EFI_SUCCESS)