Luigi 'Comio' Mantellini wrote:
So it seems Alchemy-based SoC. if so,
No. I'm working on a SoC that uses a IP core from MIPS (mips4kec). The mips core should be (formally) a standard mips core.
What I need to change on my board specific u-boot in order to use the KSEG1 address space?
what do you mean "in order to use the KSEG1 address space?" I'm not familiar with Au1XXX, but you might need CONFIG_AU1X00 in your board config. Some URLs added[1][2].
The CONFIG_AU1X00 doesn't work for me. from datasheet there aren't differences between my SoC and the standalone mips4kec. This is the memory map how depicted by the datasheet:
0x00000000--0x7fffffff KUser - Cached / Mapped 0x80000000--0x9fffffff KSEG0 - Cached / Unmapped 0xA0000000--0x9fffffff KSEG1 - Uncached / Unmapped ....
Then I'm confused. Physical address map of your SoC will be helpful. Where is the SDRAM mapped to?
I think that on my application the UNCACHED_SDRAM should map the address on KSEG1 (how it is now) but this simply doesn't work. Instead, using the PHYSADDR(a) macro... the kernel is able to start.
I suspect that there are issues on cache management. Can be?
IMHO it's not related to cache.
Shinya