Dear Ilya Averyanov, > 2012/4/20 Marek Vasut <ma...@denx.de> > > > Dear Ilya Averyanov, > > > > > 2012/4/20 Ilya Averyanov <averyanovin+ub...@gmail.com> > > > > > > > 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. > > > > > > > >2) NAND controller must be initialized before C code run. > > > > > > Sorry made a mistake. SDRAM! Not NAND! > > > > Which doesn't matter, either way you need stack ... and you can have the > > stack > > in cache ;-) > > > > Best regards, > > Marek Vasut > > Why do you insist on sdram initialization code in C?
That's how the init sequence was designed. > If you simply do as done in the other boards on this architecture? Other boards on arm architecture do init DRAM in proper place. Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
