Hi, > -----Original Message----- > From: u-boot-boun...@lists.denx.de [mailto:u-boot- > boun...@lists.denx.de] On Behalf Of Vipin Kumar > Sent: Tuesday, September 14, 2010 3:52 PM > To: Stefan Roese > Cc: u-boot@lists.denx.de; Shiraz HASHIM > Subject: Re: [U-Boot] Multiple binaries built through u-boot source > > On 9/14/2010 12:46 PM, Stefan Roese wrote: > Hello Stefan, > > > On Tuesday 14 September 2010 07:22:10 Vipin Kumar wrote: > >> This is about a generic problem which may also be faced > >> by other developers. Our SoC has a masked bootrom area > >> which copies an image from NOR/NAND memories to an internal > >> embedded SRAM. The size of this SRAM is only 8K. This > >> binary initializes the DDR for larger binaries (u-boot/OS) > >> to be placed in RAM and executed from there. > >> > >> I wanted to know if there is a generic way to create two > >> binaries from the u-boot source both compiled for different > >> address ranges. The first initializes the RAM (may be > >> something else as well) and the second is the u-boot binary > >> responsible for loading OS etc.
It's sheer coincidence that I also wanted to post a very similar query today. We have a similar requirement for OMAP platforms. Presently, we are maintaining a mini bootloader(called x-loader, based on u-boot)separately. We want to integrate x-loader with u-boot and up-stream the source code. > > > > Take a look at the NAND_SPL infrastructure (nand_spl/*). It was > created for > > platforms booting from NAND with tight restrictions (e.g. 4k image > size for > > inital setup, mostly DDR). General idea here is that 2 images are > created: > > > > a) Very small SPL (secondary program loader) image with only basic > > setup, like DDR and NAND > > b) RAM based U-Boot image > > > > Both images are combined in the build process creating a single > image that can > > be flashed into NAND. > > > > doc/README.nand-boot-ppc440 might be interesting to get some more > infos about > > this, some of it PPC4xx specific though. > > This looks promising. However, our SPL has to load u-boot from MMC. Is it OK to keep it under nand_spl directory or should we create something like 'mmc_spl'? Best regards, Aneesh _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
