Hi Simon,
Simon Glass – Fri, 8. February 2019 5:12 > Hi Tristan, > > On Mon, 4 Feb 2019 at 08:01, Tristan Bastian <tristan-c.bast...@gmx.de> wrote: > > > > Hi Simon, > > > > I'm using the nyan-big chromebook (tegra124). > > Is it possible to replace coreboot + depthcharge with just u-boot on the > internal spi flash? > > If so, do you have some instructions for that? > > Possibly, although I would suggest being careful about that. Make sure > you have a tool to revert the flash contents. Note that you will not > have signed firmware so won't get updates. Presumably you are in dev > mode anyway, I've already got myself a SOIC flash clip and was able to extract the current content of the spi flash. > The instructions are just to flash the image.bin file that comes out > of the build, once it exists. But there is no chromeos_nyan target as > yet. So your only option right now is to build an image without > verified boot, and use a script to boot Chrome OS. I have not tried on > this nyan. I'm not sure to which file you are referring to, since there is no image.bin file.. If I build u-boot with this command: "make -j4 O=b/nyan-big nyan-big_defconfig all" I'm getting these dot bin files: -rw-r--r-- 1 tristan tristan 691K Feb 8 08:09 u-boot.bin -rw-r--r-- 1 tristan tristan 691K Feb 8 08:09 u-boot-dtb.bin -rw-r--r-- 1 tristan tristan 16M Feb 8 08:09 u-boot-dtb-tegra.bin -rwxr-xr-x 1 tristan tristan 639K Feb 8 08:09 u-boot-nodtb.bin -rw-r--r-- 1 tristan tristan 16M Feb 8 08:09 u-boot-nodtb-tegra.bin -rw-r--r-- 1 tristan tristan 16M Feb 8 08:09 u-boot-tegra.bin I would only be able to flash one of these files with flashrom to the spi chip if the file size equals the flash size.. I thought the 16MB files would be right, but nyan-big only has a flash size of about 4M.. The spi flash size seems to be configured in "include/configs/nyan-big.h" with: #define CONFIG_SPI_FLASH_SIZE (4 << 20) Which is the correct flash size (4194304).. So should u-boot output a binary that I'm able to flash directly to the spi chip or are there some additional steps needed? If so, could you give me some hints on what to do? > > At the moment I'm chainloading u-boot, but this is causing some issues with > not working LPAE so I'm only getting 2 of my 4GB of memory.. > > So I would like to try and run u-boot natively to see if chainloading is the > problem or u-boot itself.. > > Or maybe you have some instructions to run coreboot + u-boot without > depthcharge? > > I suppose you could put U-Boot in the image in instead of dc and it might > work. Sorry for asking, but do you have some instructions for replacing dc? Thanks, Tristan _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
