Luigi 'Comio' Mantellini wrote:
I'm working on the porting of u-boot (1.3.1 from git) to a mips based SoC. The port seems to work fine unless the UNCACHED_SDRAM macro (used by do_bootm_linux).
Using the version from commit de9a738faa7c2f47286119c3bfebc3dfbfe7d86d (that maps the addresses on KSEG1 instead on physical addresses) the linux kernel is not able to start, while changing the macro to a PHYSADDR(a) (how was before the commit) the linux kernel starts without any problem.
In order to make my system bootable I changed the macro UNCACHED_SDRAM from:
#define UNCACHED_SDRAM(a) KSEG1ADDR(a)
to
#define UNCACHED_SDRAM(a) PHYSADDR(a) (how defined before the commit de9a738...)
So it seems Alchemy-based SoC. if so,
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].
Shinya
[1] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/32316/focus=32372 [2] http://www.linux-mips.org/wiki/Alchemy