Dear Ilya Averyanov, > 2012/4/21 Vasily Khoruzhick <anars...@gmail.com> > > > 2012/4/21 Ilya Averyanov <averyanovin+ub...@gmail.com>: > > > No have problem. > > > Available only if you boot from NOR flash. > > > If you boot from the NAND 4kb of SRAM (steppingstone) not available. > > > > For NAND boot it's mapped at 0x0 > > For NOR boot it's mapped at 0x40000000 > > > > NAND controller uses it for booting purpose, but anyway for SPL we > > should fit code into > > 4k (hardware limitation), so I think using assembly here for SDRAM init > > is OK. > > > > And how will you use the internal SRAM when you boot from NAND, if the > > SoC > > writes in the SDRAM read data from NAND, and your data will be overwritten.
Why? You'll load SPL into SRAM, then in SPL you'll copy the rest of uboot from NAND to - then already inited - SDRAM and execute it. We even have ready-to-use NAND SPL. > > > Regards > > Vasily Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
