Le 17/12/2010 04:05, Jason Liu a écrit : > There is pretty much different with I.MX51 ROM, we will not use DCD > data file to config the > DDR script since ROM has the DCD size limitation and use the advance > feature of what we > called plug-in, the plug-in code must be in the first 2K of MMC card > from 0x400 offset, that's > why we need put this code section before start.S.
This implication is simply not true, as far as I can tell. You do need to have this "plug-in" (will you explain in the end what it is exactly?) in the first 2K of MMC; but that does not mean it has to be put in u-boot and u-boot stored at start of MMC. You could just as well put the "plug-in" alone in the first 2K and u-boot from the second 2K onward, for all I understand: > The plug-in code > will be called by boot ROM > to do DDR init first and copy u-boot to DDR and jump to _start to run it. If it has to copy u-boot to DDR, then it should ne be part of u-boot. > Does anyone of expert like you and Albert and Wolfgang tell me how to > do it? It's very important for FSL > coming many SOCs support, since we will use plug-in feature of boot ROM. The first thing, I think, would be to get back to gathering your exact requirements, and only those, as per your SoC specs. From what you say of these, the requirements are not "have u-boot start in the first 2K of MMC with the "plug-in' coming first", but "have some routine in the first 2K of MMC, said routine assumed to do DDR init and payload copy"; and then, start from these reqs *only*. Amicalement, -- Albert. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
