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+This procedure from (on May 16, 2022):
+
+https://www.linux4sam.org/bin/view/Linux4SAM/SDCardBootNotice
+
+
+For SD card boot, there are several files in the first partition:
+
+BOOT.BIN  (at91bootstrap)
+u-boot.bin (U-Boot)
+uImage (kernel)
+
+
+To make the SD card as root on a Linux PC:
+
+dd if=/dev/zero of=/dev/sdx bs=10M count=1
+
+fdisk /dev/sdx
+
+Command (m for help): p
+Disk /dev/sdx: 2002 MB, 2002780160 bytes
+11 heads, 10 sectors/track, 35560 cylinders
+Units = cylinders of 110 * 512 = 56320 bytes
+Sector size (logical/physical): 512 bytes / 512 bytes
+I/O size (minimum/optimal): 512 bytes / 512 bytes
+Disk identifier: 0x00000000
+
+        Device Boot      Start         End      Blocks   Id  System
+
+Command (m for help): n
+Command action
+   e   extended
+   p   primary partition (1-4)
+p
+Partition number (1-4): 1
+First cylinder (1-35560, default 1):
+Using default value 1
+Last cylinder, +cylinders or +size{K,M,G} (1-35560, default 35560): +64M 
+
+Command (m for help): t
+Selected partition 1
+Hex code (type L to list codes): 6
+Changed system type of partition 1 to 6 (FAT16)
+
+