On Thursday 15 May 2014 04:42:58 Pavel Machek wrote:
Hi!
I am trying to understand the state of the socfpga preloader in mainline u-boot.
From what I see, this is broken and perhaps has never worked.
That's correct AFAICT.
When I build the code in u-boot-socfpga I get a healthy working u-boot-spl.bin of approx 45kbytes.
When I build the mainline u-boot code I get a broken u-boot-spl.bin of approx 3kbytes.
It seems the mainline u-boot is missing stuff, including the all-critical sdram initialisation without which the SPL is useless.
Are you able to build working u-boot proper from recent sources?
I know u-boot SPL misses critical parts, but I was told that u-boot proper should have everything. Only... I was not able to get it to work. [I'm attempting to load recent u-boot from patched/old u-boot; I know this is not exactly recommended, but due to spl/proper split, it should work AFAIK... and does for old versions.]
I have not tried booting u-boot proper from mainline. It just seemed pointless to me to be working from 2 source trees to make a single product.
I will give it a go though.
As Chin Liang See has said, there are two issues thwarting this: legal AND source conformance. The code we can fix, the legal can only be fixed by bending Altera - I am going to do that too.
Regards
Charles