On Tue, Jun 7, 2011 at 3:04 PM, Wolfgang Denk <w...@denx.de> wrote: >> BOARD_NAND >> BOARD_NAND_IN_BOOTSTRAP >> BOARD_SPIFLASH >> BOARD_SPIFLASH_IN_BOOTSTRAP >> BOARD_SDCARD >> BOARD_SDCARD_IN_BOOTSTRAP > > Are these independent targets? I think you don't run a > "./MAKEALL BOARD_SDCARD_IN_BOOTSTRAP" alone, right?
Correct, however I was hoping to use a normal build system to make this image. With the only difference being that CONFIG_IN_BOOTSTRAP is defined when parsing the board config file. > You can set all types of make variable sinternally during different > stages of the build, like we already do with the nand_spl code. Right but nand_spl provides more Makefiles for building it's own image. I want to reuse the normal u-boot build system to create this shim/bootstrap image. > I have to admit that I don't even understand why you would need > separate top-level FOO and FOO_IN_BOOTSTRAP make targets. Please > elucidate. Sorry, let me try to explain some more. Certain boards require some sort of shim, or spl for booting from media other than NOR on our parts. We need this shim to perform DDR initialization. This shim does not need to be anything but a stripped down version of u-boot since it needs to be <256k and contain the DDR SPD initialization code. Therefore I just wanted to reuse the u-boot build system as is and add some configuration changes to create all the final images for booting this board. So when I build a target for my board the following happens: make FOO -> builds u-boot.bin to run from RAM -> calls make FOO_IN_BOOTSTRAP to run from L2 and configure DDR -> NAND will also have a nand_spl shim as well (where as SDCARD and SPI booting currently do not have support in u-boot for making this shim) The FOO_IN_BOOTSTRAP build above creates a u-boot image that runs from L2 and its BOOTCOMMAND is set such that it will automatically load the final u-boot image from the boot media to ram and then execute the full version of u-boot. -M _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
