On Fri, 2008-06-13 at 10:24 -0300, Alan Carvalho de Assis wrote: > Hi, > I am trying to port U-Boot to MX31PDK board, but I getting a problem > related to lowlevel initialization to boot from NAND flash memory. > > The problem is because cpu/arm1136/start.S waste so much space with > IRQ/FIQ handling and stack initialization then lowlevel_init function > is placed at 0x400 position. As the NAND controller from i.MX31 copy > just 2KB to NANDFC internal buffer and lowlevel_init has about 0x6b0 > bytes then the final position is after 0x800 (2KB) then the SDRAM > initialization routine and NAND block copy to SDRAM doesn't work. > > Comparing with RedBoot I verified it place the lowlevel routines at > 0x120 position then it fit in 2KB and all works fine. > > I need help to modify cpu/arm1136/start.S and place the lowlevel_init > at 0x120 position instead 0x400. I am not ARM assembly expert then any > help is welcome. >
I ditched the entire reuse thing when I implemented nand boot for a 5121e platform. 2k was to little space to try to force in the generic files. just make a new start.S that do only the things it needs to. basically it only sets up the stack pointer to the internal SRAM. then the C code relocates the code from the nand controllers internal 2k into internal SRAM. sets up the memory controller , then reads out u-boot into dram and jumps to _start. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
