Hi Magnus, On 2/6/2011 10:03 AM, Magnus Lilja wrote: ...
> I've done some testing now and ended up comparing start.S for ARM1136 with > ARM926EJS since > the latter is used on the Karo TX25 board which seems to have been updated and > also boots from NAND. Thanks for looking into this. > The result is that applying the following patch on top of Fabios patch makes > the i.MX31 PDK > boot from NAND. Booting Linux from TFTP works nicely. However the first few > lines of output > from U-boot is missing, only the "NAND: 256 MB" line is shown. I haven't > tried to understand > how booting works nowadays and why these changes work, perhaps someone with > more insight > in the mechanisms can figure out the correct assembler code. I think that the missing lines can be fixed by using a similar approach as to this patch: http://git.denx.de/?p=u-boot.git;a=commitdiff;h=877eb0f91543dc5bca385bb6d22454b1d43f3e2d > I have no idea if this breaks other boards but at least it's start for > further work. I tried > it on the imx31 litekit (which boots from NOR) but that board doesn't seem to > boot even before applying Fabios patch, > I'll see if I can figure out why that board is broken now. Don't know when > though. I will let others comment about the changes you did in arch/arm/cpu/arm1136/start.S Will also try it later today. Thanks, Fabio Estevam > Regards, Magnus Lilja > > diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S > index 12545c2..7d75ecf 100644 > --- a/arch/arm/cpu/arm1136/start.S > +++ b/arch/arm/cpu/arm1136/start.S > @@ -163,6 +163,9 @@ call_board_init_f: > bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ > ldr r0,=0x00000000 > > +#if 1 > + bl board_init_f > +#else > #ifdef CONFIG_NAND_SPL > bl nand_boot > #else > @@ -172,6 +175,7 @@ call_board_init_f: > bl board_init_f > #endif /* CONFIG_ONENAND_IPL */ > #endif /* CONFIG_NAND_SPL */ > +#endif > > > /*------------------------------------------------------------------------------*/ > > @@ -266,11 +270,19 @@ clbss_l:str r2, [r0] /* clear > loop... */ > * initialization, now running from RAM. > */ > #ifdef CONFIG_NAND_SPL > +#if 1 > + ldr r0, _nand_boot_ofs > + mov pc, r0 > + > +_nand_boot_ofs: > + .word nand_boot > +#else > ldr r0, _nand_boot_ofs > adr r1, _start > add pc, r0, r1 > _nand_boot_ofs: > .word nand_boot - _start > +#endif > #else > jump_2_ram: > ldr r0, _board_init_r_ofs > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
