[U-Boot] SPL variant of sunxi nand module

[Nikolai Zhubr <n-a-zhubr@yandex.ru>]

Hi all,

While fighting with this A20-olinuxino nand boot process I've initially 
found that some essential nand-related parameters are apparently missing 
by default, preventing reasonable nand operation, so I started debugging 
this gradually.

 > U-Boot SPL 2019.01-rc2 (Dec 20 2018 - 16:30:46 +0300)
 > CPU: 912000000Hz, AXI/AHB/APB: 3/2/2
 > DRAM: 1024 MiB
 > Trying to boot from NAND

Now I've discovered that SPL-build variant of sunxi_nand module is 
missing the sunxi_nand_init() whatsoever. Apparently it is on purpose, 
because:

#ifndef CONFIG_SPL_BUILD
         sunxi_nand_init();
#endif

And I cannot simply un-ifdef sunxi_nand_init() here, because the SPL 
build would fail with undefined symbol then, but I'm wondering, where 
are all values (like ECC strength and such) are expected to come from 
instead? Is SPL nand loader is supposed to be usable at all currently?


Thank you,

Regards,
Nikolai