Android System Programming

Fixing up the ROM image

Before the ROM image can be used, the ROM image has to be updated due to VirtualBox having the following requirements on ROM image size:

• Size must be 4K aligned (that is, a multiple of 4,096)
• Size must not be greater than 64K

Let's check the image size first and make sure that it is not larger than 65,536 bytes (64K):

$ ls -l bin/1af41000.rom | awk '{print $5}'62464  

We can see that it is less than 64K. Now we have to pad the image file to a 4K boundary. We can do this using the following commands:

$ python>>> 65536 - 62464             # Calculate padding size3072>>> f = open('bin/1af41000.rom', 'a')>>> f.write('\0' * 3072)      # Pad with zeroes>>> f.close()  

We check the image file size again:

$ ls -l bin/1af41000.rom | awk ...