[U-Boot] [PATCH v5 24/30] efi_loader: Add distro boot script for removable media

Tom Rini
2016-03-09T23:16:11Z

On Thu, Mar 10, 2016 at 12:05:12AM +0100, Alexander Graf wrote:
>
>
> On 04.03.16 01:10, Alexander Graf wrote:
> > UEFI defines a simple boot protocol for removable media. There we should look
> > at the EFI (first GPT FAT) partition and search for /efi/boot/bootXXX.efi with
> > XXX being different between different platforms (x86, x64, arm, aa64, ...).
> >
> > This patch implements a simple version of that protocol for the default distro
> > boot script. With this we can automatically boot from valid UEFI enabled
> > removable media.
> >
> > Because from all I could see U-Boot by default doesn't deliver device tree
> > blobs with its firmware, we also need to load the dtb from somewhere. Traverse
> > the same EFI partition for an fdt file that fits our current board so that
> > an OS receives a valid device tree when booted automatically.
> >
> > Signed-off-by: Alexander Graf <agraf@suse.de>
> > Reviewed-by: Simon Glass <sjg@chromium.org>
> > ---
> > include/config_distro_bootcmd.h | 47 ++++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 46 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/config_distro_bootcmd.h b/include/config_distro_bootcmd.h
> > index 37c6b43..c19f1b0 100644
> > --- a/include/config_distro_bootcmd.h
> > +++ b/include/config_distro_bootcmd.h
> > @@ -90,6 +90,48 @@
> > BOOT_TARGET_DEVICES_references_UBIFS_without_CONFIG_CMD_UBIFS
> > #endif
> >
> > +#ifdef CONFIG_EFI_LOADER
> > +#if defined(CONFIG_ARM64)
> > +#define BOOTEFI_NAME "bootaa64.efi"
> > +#elif defined(CONFIG_ARM)
> > +#define BOOTEFI_NAME "bootarm.efi"
> > +#endif
> > +#endif
> > +
> > +#ifdef BOOTEFI_NAME
> > +#define BOOTENV_SHARED_EFI \
> > + "boot_efi_binary=" \
> > + "load ${devtype} ${devnum}:${distro_bootpart} " \
> > + "${kernel_addr_r} efi/boot/"BOOTEFI_NAME"; " \
> > + "bootefi ${kernel_addr_r}\0" \
> > + \
> > + "load_efi_dtb=" \
> > + "load ${devtype} ${devnum}:${distro_bootpart} " \
> > + "${fdt_addr_r} ${prefix}${fdt_name}; " \
> > + "fdt addr ${fdt_addr_r}\0" \
> > + \
> > + "efi_dtb_prefixes=/ /dtb/ /dtb/current/\0" \
> > + "scan_dev_for_efi=" \
> > + "for prefix in ${efi_dtb_prefixes}; do " \
> > + "if test -e ${devtype} " \
> > + "${devnum}:${distro_bootpart} " \
> > + "${prefix}${fdt_name}; then " \
> > + "run load_efi_dtb; " \
> > + "fi;" \
> > + "done;" \
> > + "if test -e ${devtype} ${devnum}:${distro_bootpart} " \
> > + "efi/boot/"BOOTEFI_NAME"; then " \
> > + "echo Found EFI removable media binary " \
> > + "efi/boot/"BOOTEFI_NAME"; " \
> > + "run boot_efi_binary; " \
> > + "echo EFI LOAD FAILED: continuing...; " \
> > + "fi; "
>
> Whoever applies this, please also apply the patch below on top and
> squash it in (or tell me to resend). Without the fix, we end up slurping
> the boot_prefix variable into the scan_dev_for_efi variable.
>
>
> Alex
>
> diff --git a/include/config_distro_bootcmd.h
> b/include/config_distro_bootcmd.h
> index e7d7002..ad9045e 100644
> --- a/include/config_distro_bootcmd.h
> +++ b/include/config_distro_bootcmd.h
> @@ -125,7 +125,7 @@
> "efi/boot/"BOOTEFI_NAME"; " \
> "run boot_efi_binary; " \
> "echo EFI LOAD FAILED: continuing...; " \
> - "fi; "
> + "fi; \0"
> #define SCAN_DEV_FOR_EFI "run scan_dev_for_efi;"
> #else
> #define BOOTENV_SHARED_EFI

Please make just a v6 of this patch and re-post, thanks!

--
Tom
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