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; " +#define SCAN_DEV_FOR_EFI "run scan_dev_for_efi;" +#else +#define BOOTENV_SHARED_EFI +#define SCAN_DEV_FOR_EFI +#endif + #ifdef CONFIG_CMD_SATA #define BOOTENV_SHARED_SATA BOOTENV_SHARED_BLKDEV(sata) #define BOOTENV_DEV_SATA BOOTENV_DEV_BLKDEV @@ -217,6 +259,7 @@ BOOTENV_SHARED_SCSI \ BOOTENV_SHARED_IDE \ BOOTENV_SHARED_UBIFS \ + BOOTENV_SHARED_EFI \ "boot_prefixes=/ /boot/\0" \ "boot_scripts=boot.scr.uimg boot.scr\0" \ "boot_script_dhcp=boot.scr.uimg\0" \ @@ -258,7 +301,9 @@ "for prefix in ${boot_prefixes}; do " \ "run scan_dev_for_extlinux; " \ "run scan_dev_for_scripts; " \ - "done\0" \ + "done;" \ + SCAN_DEV_FOR_EFI \ + "\0" \ \ "scan_dev_for_boot_part=" \ "part list ${devtype} ${devnum} -bootable devplist; " \