commit 1cd41052f7a7cd42ea14ea53b7280c73624aba3f
Author: Johannes Meixner <jsmeix@suse.com>
Date:   Mon Mar 21 12:14:21 2022 +0100

    Merge pull request #2774 from rear/jsmeix-1024-USB_UEFI_PART_SIZE
    
    In default.conf increase USB_UEFI_PART_SIZE to 1024 MiB,
    cf. https://github.com/rear/rear/pull/1205
    in particular to also make things work by default when additional
    third-party kernel modules and firmware (e.g. from Nvidia) are used,
    cf. https://github.com/rear/rear/issues/2770#issuecomment-1068935688

diff --git a/usr/share/rear/conf/default.conf b/usr/share/rear/conf/default.conf
index 8faa56aa..17a764cb 100644
--- a/usr/share/rear/conf/default.conf
+++ b/usr/share/rear/conf/default.conf
@@ -872,13 +872,20 @@ USB_PARTITION_ALIGN_BLOCK_SIZE="8"
 # in MiB when formatting a medium by the format workflow.
 # If USB_UEFI_PART_SIZE is empty or invalid (i.e. not an unsigned integer larger than 0)
 # the user must interactively enter a valid value while running the format workflow.
-# The default value of 400 MiB should be sufficiently big and it is in compliance
-# with the 8 MiB partition alignment default value ( 400 = 8 * 50 )
-# and even with a 16 MiB partition alignment value ( 400 = 16 * 25 )
+# The default value of 1024 MiB should be sufficiently big
 # cf. https://github.com/rear/rear/pull/1205
+# in particular when third-party kernel modules and firmware (e.g. from Nvidia) are used
+# cf. https://github.com/rear/rear/issues/2770#issuecomment-1068935688
+# and 1024 MiB is in compliance with the 8 MiB partition alignment value ( 1024 = 8 * 128 )
+# and also with higher 2^n MiB partition alignment values.
+# Furthermore the default value of 1024 MiB results that the FAT filesystem of the ESP
+# will be in compliance with that the ESP should officially use a FAT32 filesystem
+# because mkfs.vfat automatically makes a FAT32 filesystem starting at 512 MiB
+# (a FAT16 ESP works in most cases but causes issues with certain UEFI firmware)
+# cf. https://github.com/rear/rear/issues/2575
 # The value of USB_UEFI_PART_SIZE will be rounded to the nearest
 # USB_PARTITION_ALIGN_BLOCK_SIZE chunk:
-USB_UEFI_PART_SIZE="400"
+USB_UEFI_PART_SIZE="1024"
 #
 # Default boot option (i.e. what gets booted automatically after some timeout)
 # when EXTLINUX boots the USB stick or USB disk or other disk device on BIOS systems.