[U-Boot] [RFC v3 10/10] cmd: add efibootmgr command

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Tue, Apr 16, 2019 at 07:27:10AM +0200, Heinrich Schuchardt wrote:
> On 4/16/19 6:24 AM, AKASHI Takahiro wrote:
> >Add CONFIG_CMD_STANDALONE_EFIBOOTMGR.
> >With this patch, EFI boot manager can be kicked in by a standalone
> >command, efibootmgr.
> >
> >Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> >---
> >  cmd/Kconfig   |  8 ++++++++
> >  cmd/bootefi.c | 35 +++++++++++++++++++++++++++++++++++
> >  2 files changed, 43 insertions(+)
> >
> >diff --git a/cmd/Kconfig b/cmd/Kconfig
> >index 0b07b3b9d777..6c9a9f821e54 100644
> >--- a/cmd/Kconfig
> >+++ b/cmd/Kconfig
> >@@ -224,6 +224,14 @@ config CMD_BOOTEFI
> >  	help
> >  	  Boot an EFI image from memory.
> >
> >+config CMD_STANDALONE_EFIBOOTMGR
> >+	bool "Enable EFI Boot Manager as a standalone command"
> >+	depends on CMD_BOOTEFI
> >+	default n
> >+	help
> >+          With this option enabled, EFI Boot Manager can be invoked
> >+	  as a standalone command.
> >+
> >  config CMD_BOOTEFI_HELLO_COMPILE
> >  	bool "Compile a standard EFI hello world binary for testing"
> >  	depends on CMD_BOOTEFI && !CPU_V7M && !SANDBOX
> >diff --git a/cmd/bootefi.c b/cmd/bootefi.c
> >index 97d49a53a44b..1afa86256670 100644
> >--- a/cmd/bootefi.c
> >+++ b/cmd/bootefi.c
> >@@ -631,3 +631,38 @@ void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
> >  		bootefi_image_path = NULL;
> >  	}
> >  }
> >+
> >+#ifdef CONFIG_CMD_STANDALONE_EFIBOOTMGR
> >+static int do_efibootmgr_cmd(cmd_tbl_t *cmdtp, int flag, int argc,
> >+			     char * const argv[])
> >+{
> >+	char *fdt_opt;
> >+	int ret;
> >+
> >+	if (argc != 1)
> >+		return CMD_RET_USAGE;
> 
> Why would you not allow to pass a device tree address?

I think I explained in the past:
The current *secure boot* feature in U-Boot assumes that a single
command without any arguments be invoked. See cli_secure_boot_cmd()
in common/cli.c.

> I think we do not need to different ways to invoke the boot manager.
> 
> We should either have either `bootefi bootmgr` or `efibootmgr`.

This patch is not essential in this patch series, so it's up to you
if it's merged or not.
I will re-visit this issue when I submit *secure boot* patch.

Thanks,
-Takahiro Akashi


> Best regards
> 
> Heinrich
> 
> >+
> >+	fdt_opt = env_get("fdtaddr");
> >+	if (!fdt_opt)
> >+		fdt_opt = env_get("fdtcontroladdr");
> >+
> >+	ret = do_efibootmgr(fdt_opt);
> >+
> >+	free(fdt_opt);
> >+
> >+	return ret;
> >+}
> >+
> >+#ifdef CONFIG_SYS_LONGHELP
> >+static char efibootmgr_help_text[] =
> >+	"(no arguments)\n"
> >+	" - Launch EFI boot manager and execute EFI application\n"
> >+	"   based on BootNext and BootOrder variables\n";
> >+#endif
> >+
> >+U_BOOT_CMD(
> >+	efibootmgr, 1, 0, do_efibootmgr_cmd,
> >+	"Launch EFI boot manager",
> >+	efibootmgr_help_text
> >+);
> >+#endif /* CONFIG_CMD_STANDALONE_EFIBOOTMGR */
> >
>