Changes between Version 1 and Version 2 of MakingBootableCard

Timestamp:

Jan 24, 2019, 8:33:48 AM (5 years ago)

Author:

Eric Hazen

Comment:

--

MakingBootableCard

@@ -3 +3 @@
 https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841655/Prepare+Boot+Medium
 
-Copy BOOT.BIN and image.ub to first partition, then boot.
+My version:
+
+Find the device name.  For my Lenovo laptop with built-in card reader, it's {{{/dev/mmcblk0}}}.
+Partitions are {{{/dev/mmcblk0p1}}} etc.  Unmount the card if mounted.
+
+'''Erase the first sector'''
+
+{{{
+  $ dd if=/dev/zero of=/dev/xxxx bs=1024 count=1
+}}}
+
+'''Calculate {{{new_cylinders}}}
+
+{{{
+  $ fdisk -l /dev/xxxx
+
+  Disk /dev/sdb: 8068 MB, 8068792320 bytes
+  249 heads, 62 sectors/track, 1020 cylinders, total 15759360 sectors
+  Units = sectors of 1 * 512 = 512 bytes
+  Sector size (logical/physical): 512 bytes / 512 bytes
+  I/O size (minimum/optimal): 512 bytes / 512 bytes
+  Disk identifier: 0x00000000
+  
+  Disk /dev/sdb doesn't contain a valid partition table
+}}}
+
+Note the size in bytes (i.e. 8068792320).  Calculate:
+
+{{{new_cylinders = size_in_bytes/8225280}}}
+
+(round down).  For this 8Gb example the result is 980.
+
+'''Partition the card'''
+
+Creat one 200MB FAT32 partition and the remainder as ext2
+(ext4 should work too).  First, have to set CHS correctly.
+
+{{{
+  $ fdisk /dev/xxxx
+}}}
+
+(delete any existing partitions; shouldn't be any)
+
+{{{
+  Command (m for help): x
+  Expert command (m for help): h
+  Number of heads (1-256, default 30): 255
+  Expert command (m for help): s
+  Number of sectors (1-63, default 29): 63
+  Expert command (m for help): c
+  Number of cylinders (1-1048576, default 2286): <new_cylinders calculated from above>
+  Expert command (m for help): r
+}}}
+
+Now create partitions:
+
+{{{
+Command (m for help): n
+Partition type:
+ p primary (0 primary, 0 extended, 4 free)
+ e extended
+Select (default p): p
+Partition number (1-4, default 1): 1
+First sector (2048-15759359, default 2048):
+Using default value 2048
+Last sector, +sectors or +size{K,M,G} (2048-15759359, default 15759359): +200M
+  
+Command (m for help): n
+Partition type:
+ p primary (1 primary, 0 extended, 3 free)
+ e extended
+Select (default p): p
+Partition number (1-4, default 2): 2
+First sector (411648-15759359, default 411648):
+Using default value 411648
+Last sector, +sectors or +size{K,M,G} (411648-15759359, default 15759359):
+Using default value 15759359
+}}}
+
+Set bootable flag, partition types:
+
+{{{
+Command (m for help): a
+Partition number (1-4): 1
+  
+Command (m for help): t
+Partition number (1-4): 1
+Hex code (type L to list codes): c
+Changed system type of partition 1 to c (W95 FAT32 (LBA))
+  
+Command (m for help): t
+Partition number (1-4): 2
+Hex code (type L to list codes): 83
+}}}
+
+Check table and write changes:
+
+{{{
+Command (m for help): p
+  
+Disk /dev/sdb: 8068 MB, 8068792320 bytes
+249 heads, 62 sectors/track, 1020 cylinders, total 15759360 sectors
+Units = sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 512 bytes
+I/O size (minimum/optimal): 512 bytes / 512 bytes
+Disk identifier: 0x920c958b
+  
+ Device Boot Start End Blocks Id System
+/dev/sdb1 * 2048 411647 204800 c W95 FAT32 (LBA)
+/dev/sdb2 411648 15759359 7673856 83 Linux
+  
+Command (m for help): w
+The partition table has been altered!
+  
+Calling ioctl() to re-read partition table.
+  
+WARNING: If you have created or modified any DOS 6.x
+partitions, please see the fdisk manual page for additional
+information.
+Syncing disks.
+}}}
+
+'''Create filesystems'''
+
+{{{
+mkfs.vfat -F 32 -n boot /dev/sdX1
+mkfs.ext4 -L root /dev/sdX2
+}}}
+
+'''Mount boot partition'''
+
+{{{
+mkdir -p /mnt/boot
+mount /dev/sdX1 /mnt/boot
+}}}
+
+'''Copy required files'''
+{{{
+cp BOOT.BIN /mnt/boot
+cp image.ub /mnt/boot
+umount /mnt/boot
+}}}