> Rockchip bootrom first reads 1KB data from nand at offset 0x10080C00 and > executes it. Then waits for back to bootrom and loads another 32KB to sram > which also executes. Sdram initialisation code needs to be in one of these two > steps. Then bootloader loads another ~200KB of data at offset 0x60000000 > and jumps to it. > > 32KB of data is a little low for tpl + spl part and ~200KB data is to low for > u-boot part(for example to boot from mmc you need to disable usb support. > > My solution to size problem is to move sdram initialisation code to tpl stage, > move spl part to third stage(reading 200KB data) and add support for loading > u-boot by spl from ext2/4, fat partitions. > > But moving sdram initialisation code to tpl increases size of tpl above 1KB > (first boot stage). Solution to this is to add code which will be below 1KB > offset in tpl binary and do back to bootrom at very beginning of the tpl > execution. > > Adding this few lines of code here meets these conditions. > > Signed-off-by: Paweł Jarosz <paweljarosz3...@gmail.com> > --- > arch/arm/cpu/armv7/start.S | 13 +++++++++++++ > 1 file changed, 13 insertions(+) >
Acked-by: Philipp Tomsich <philipp.toms...@theobroma-systems.com> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
