Walk the partition table if the requested partition is not bootable Previously, if the specified boot partition was not bootable the bootloader would stop and advance to the next BOOT_ORDER. If the new PARTITION_WALK option is set to 1 the bootloader will now check each partition in turn starting from the specified partition before advancing the BOOT_ORDER. This feature is intended for use with A/B systems to handle the case where autoboot.txt is missing / corrupted. This change enables the system to failover to the next available bootable partition. The autoboot.txt file is not scanned during the partition-walk phase i.e. there is no recursive processing of autoboot.txt files. This option is only supported on physical block devices (SD, NVMe, USB) and not RAMDISK. USB assumes a single high speed device, partition walks on multiple USB devices is not recommended and may cause timeouts.
Improve keyboard handling in boot menu Try and make it more likely that we have enough time to perform key detection. Ignore mice, which were being enumerated and slowing things down.