Partition and image sizes

To change the size of your target image or partitions, you must modify a variant-specific configuration file.

Note:

For x86 boards, you should note the following when creating partitions:

The boot process is different from ARMLE-v7 boards.
The IFS gets installed to a different location.

See Building Embedded Systems for more information about the differences in the x86 and ARM boot processes.

Calculating the size of a partition

The size of a partition in the previous example is calculated as follows:

heads x sectors_per_track x cylinders = number_of_sectors
number_of_sectors x sector_size = partition size

64 x 32 x 3724 = 7626752
7626752 x 512 = 3904897024 bytes

Therefore, the size of the partition is 3724 MB.

Calculating the maximum size of a target image

To calculate the total size of the image, you must multiply the values given in the [disk] section of the configuration file:

     heads
   x sectors_per_track
   x cylinders
   x sector_size
------------------------------
 total maximum size of image

Note: The disk section doesn't specify a partition, but provides important size information and must appear at the top of the configuration file, before any partitions are specified.

For the R-Car H3 Starter example for the sd variant, the maximum size of the image is 3.9 GB (3.63 GB actual) and is calculated as follows:

     64 heads
   x 32 sectors_per_track
   x 3724 cylinders
   x 512 sector_size
--------------------------------------
 3904897024 bytes for a total of 3.63 GB for the total maximum size 
 of the image

Note:

Limitations:

The total size of all partitions can't exceed the total size of the image.
The maximum number of heads is 255.
The maximum number of sectors_per_track is 63.