On Thu, Nov 10, 2011 at 07:24:00PM +0000, McClintock Matthew-B29882 wrote:
On Thu, Nov 10, 2011 at 11:47 AM, Timur Tabi timur@freescale.com wrote:
I boot off of SDCARD (P2020COME_SDCARD_config). To write the U-Boot image to the microSD card, I use a tool provided with the BSP called "boot_format-1.0.0". Maybe you are familiar with it?
I think that qualifies as multi-stage booting. The SD card is not mapped at address fff00000 at POR time, which is needed to boot a single-stage U-Boot. Therefore, you must have a multi-stage U-Boot.
I'm not familiar with boot_format-1.0.0, but my guess is that it creates the pre-boot loader.
Timur,
Did you test your CCSRBAR changes with a board that uses the on chip rom as well as L2SRAM to boot? Does the COME board load from SDCARD to DDR or to L2SRAM? I suspect it's L2SRAM since this board has 512kB which is large enough for a stock u-boot image.
I boot using the on-chip ROM, loading U-Boot from SD card to DDR. The configuration file I was provided for boot_format-1.0.0 uses DDR, so it is what I have continued to use. I remember seeing a comment somewhere saying that the L2 doesn't work on P2020 due to some hardware problem, though I cannot find that comment at the moment.
My configuration for boot_format is attached. The configuration is described in the P2020RM (section 4.5) and Freescale Document Number AN3659, titled "Booting from On-Chip ROM (eSHDC or eSPI)" section 2.5.1.
My configuration is attached. I'm happy to test using the L2SRAM instead, if I can figure out what to change in the attached configuration file.
Thanks, Ira