Dear Ilya Averyanov, > 2012/4/20 Marek Vasut <ma...@denx.de> > > > Dear Ilya Averyanov, > > > > > 2012/4/20 Marek Vasut <ma...@denx.de> > > > > > > > Dear Ilya Averyanov, > > > > > > > > [...] > > > > > > > > > > > > > > > .word 0x32 > > > > > > > > > > > + .word 0x30 > > > > > > > > > > > + .word 0x30 > > > > > > > > > > > > > > > > > > > > What this undocumented stuff? > > > > > > > > > > > > > > > > > > SoC specific, I pasted it from smdk2410, it's for > > > > > > > > > initialize the > > > > > > > > > > > > DRAM. > > > > > > > > > > > > > > Can't you init DRAM in some more fitting place? Also document > > > > > > > > this? > > > > > > > > > > > > > > I don't know, this part is a bit difficult for me, but I'm > > > > > > > going > > > > to > > > > > > try > > > > > > > > > > > to document it with the help of the SoC documentation. > > > > > > > > > > > > > > For the place, should I move it to mini2440.c in > > > > > > > arch_cpu_init() > > > > or > > > > > > > > > board_early_init_f() ? I don't really know the difference. > > > > > > > > > > > > dram_init() maybe ? > > > > > > > > > > You propose to initialize the SDRAM controller in dram_init ()? > > > > > > > > Well yes, ain't it more fitting ? > > > > > > > > Best regards, > > > > Marek Vasut > > > > > > No. We have to two reasons why this is not the case. > > > 1) Open u-boot/arch/arm/cpu/arm920t/start.S:328 > > > cpu_init_crit > > > ...... > > > line 346 > > > > > > /* > > > > > > * before relocating, we have to setup RAM timing > > > * because memory timing is board-dependend, you will > > > * find a lowlevel_init.S in your board directory. > > > */ > > > > Well don't setup run in lowlevel_init.S then ? > > > > > 2) NAND controller must be initialized before C code run. > > > > Why? > > > > Best regards, > > Marek Vasut > > mmm... > Because we need a stack. > The stack is in RAM.
mmm... You can lock cache entries to create space for stack in cache. That's how it's done on PXA, check it. Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
