[U-Boot] am335x: GPMC: reading speed with prefetch mode

[Daniel Mack <zonque@gmail.com>]

On 03/19/2015 04:13 PM, Yegor Yefremov wrote:
> Strange. Have tried with "nand read" command, but still the same
> result with and without CONFIG_NAND_OMAP_GPMC_PREFETCH :
> 
> [2.150655 0.001006] NAND read: device 0 offset 0x260000, size 0x1200000
> [15.978943 13.828288]  18874368 bytes read: OK

What about adding some debug prints to the prefetch setup function and
see if it is executed at all?

> Daniel, do you have the numbers? Images size and load time? What can I expect?

I don't currently have the setup at hand, sorry. But the number I recall
from an email conversation back then is: The time from power-on, loading
SPL, loading U-Boot, leeching a 6MB uImage, jumping into it waiting for
the console to start dumping the kernel boot messages was less than 5
seconds in total.



Thanks,
Daniel