Hi Michael, On Mon, Jun 13, 2016 at 06:38:31PM -0400, Michael D. Burkey wrote: > I have already spoken with Sascha about this a bit, but figured I'd > throw it out here in case anyone had any suggestions. > > Specifically, I'm updating the support for the Variscite SOM to handle > the newest version of their SOM -- which now includes an EEPROM that > contains a "DCD-like" script for configuring the DDR3 timing > parameters. > > Essentially this means that I have to follow a boot procedure similar > to that used by the current Wandboard setup, which loads part of > barebox into IRAM/OCRAM on the iMX6, read/configures the DDR3 timings, > then reloads barebox into DDR3 and starts it. > > I think I have gotten things more or less setup at this point and have > copied the setup from the Wandboard, but am having trouble getting > things to actually start from the internal RAM on the board. > > For now, I have a correct DCD already built-in that preconfigures DDR3 > "just in case" and if I set the load address to be DDR3, then > everything starts up as normal -- which in and of itself points to a > problem. > > My suspicion is that the boot ROM is still trying to load the full > image rather than just part of it -- which means that, when I point it > to the IRAM/OCRAM, it is writing to the aliased memory regions of the > built in RAM and overwriting itself in the process. > > What/where actually controls the length of the code that gets > automatically loaded by the iMX6 internal boot ROM and what needs to > be updated? Your image name should end with .imx-sram-img, see images/Makefile.imx: FILE_barebox-imx6-wandboard.img = start_imx6_wandboard.imx-sram-img Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
