Hello!

I'm using U-boot with x86 hardware (Atom C2000) and Linux, and I've noticed that the AHCI driver in U-boot is quiet much slower than the one in Linux. The drive connected is an 8 GB SATA SSD.

U-boot:

=> time scsi read 0x10000000 0 0x100000

SCSI read: device 0 block # 0, count 1048576 ... 1048576 blocks read: OK

time: 2 minutes, 19.318 seconds

Linux:

# sync && echo 3 > /proc/sys/vm/drop_caches # time dd if=/dev/sda of=/dev/null count=1048576 1048576+0 records in 1048576+0 records out real 0m 26.75s user 0m 0.40s sys 0m 2.72s

Is there maybe anything that could be done to improve AHCI performance?