On Tue, Feb 26, 2013 at 12:33:52PM +0100, Beno??t Th??baudeau wrote: > On Tuesday, February 26, 2013 8:19:42 AM, Marek Vasut wrote: > > Dear Beno??t Th??baudeau, > > > > > Dear Scott Wood, > > > > > > On Tuesday, February 26, 2013 12:07:25 AM, Scott Wood wrote: > > > > On 02/25/2013 05:03:30 PM, Marek Vasut wrote: > > > > > Dear Scott Wood, > > > > > > > > > > > So maybe we need a more general (but optional) CONFIG_BUILD_TARGET. > > > > > > > > > > Can you elaborate? > > > > > > > > Same as CONFIG_SPL_TARGET, but not SPL-specific. Basically a way for a > > > > board config file to add to $(ALL-y). > > > > > > > > > > So each one would set the appropriate CONFIG_BUILD_TARGET for > > > > > > > > > > whatever > > > > > > > > > > > needs to get built, and then something like CONFIG_NAND_IMAGE could > > > > > > hold the image name that should be linked to produce a standard > > > > > > u-boot-nand.bin output. > > > > > > > > > > Yea, sounds reasonable. But why call it CONFIG_ , it can't be stored > > > > > in the > > > > > board.h files, it has to be somewhere in the Makefile hierarchy. > > > > > > > > Why can't it go in the board.h files? > > > > > > We could do all that, but should we? As I said to Marek, I think that it's > > > a big mistake to omit the SPL here. The only other solution to get a > > > reliable boot would be the DBBT, but it's very hard to use in real life, > > > away from a production line. The SPL is really easy to enable here, and > > > it's only a matter of time before someone gets bitten by this lack of > > > reliability, so why not just do things right? The boot time and footprint > > > of an SPL would really be negligible, and it's not because other > > > implementations omit both SPL and a valid DBBT that U-Boot should do the > > > same. > > > > I'm not against SPL, but then we're starting to drift away from the whole > > idea > > of generating u-boot-nand.bin or similar image. Being able to generate > > u-boot- > > nand.bin or u-boot-sd.bin etc ... on a per-CPU basis (since this is CPU > > specific) is the ultimate goal here, whatever is embedded in the image. > > OK, I didn't know that this was your goal here. If the contents of the image > do > not matter, then my u-boot-with-nand-spl.imx could be renamed into your > u-boot-nand.bin with the appropriate FCB header, and CONFIG_SPL_TARGET could > be > changed to something more generic as Scott explained.
I wonder how the rules start looking. In the end, some way to say "Here is the image to write to NAND, called u-boot-nand.bin" which will have whatever board needs (say spl/u-boot-spl.bin + some header attached followed by pad, followed by u-boot.img). And also allow for u-boot-nand.bin to be what someone else needs (say a different header on u-boot-spl.bin), etc. -- Tom
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