13 Mar
2020
13 Mar
'20
2:09 p.m.
On 13/03/2020 03.07, Heinrich Schuchardt wrote:
Am March 13, 2020 1:50:41 AM UTC schrieb Kever Yang kever.yang@rock-chips.com:
The image is usually stored in block device like emmc, SD card, make the offset of image data aligned to block(512 byte) can avoid data copy during boot process. eg. SPL boot from FIT image with external data:
- SPL read the first block of FIT image, and then parse the header;
- SPL read image data separately;
- The first image offset is the base_offset which is the header size;
- The second image offset is just after the first image;
- If the offset of imge does not aligned, SPL will do memcpy;
The header size is a ramdon number, which is very possible not aligned, so add align for FIT header and image data for better performance.
Why not let -B take an integer argument, so the same flag can be used the day someone needs stuff to be aligned on a 4096 byte boundary?
Rasmus