Hi Stefano -
Thanks for your very quick response to my posting. I'm going to follow up just for informational purposes, as I was able to get Freescale SDK (LTIB) Kernel to boot find with current U-Boot.
- Should above "raw" load from SD work? Probably my preference, but
have
an open mind.
It should work, but I admit I tested booting from partitions and from network. Your assumption that CRC is ok let me think that there should be no problem to read the kernel from the SD card, even in raw mode.
You could verify if your kernel boots independently from storage. Try to load the kernel from net instead from SD.
Looks like the problem I was having is the Freescale SDK (LTIB) had a .config file that ended up with the wrong load address; was picking up the MX53 (0x70008000 versus 0x90008000) load/build addys. Don't know why it ever worked.... I hacked the right address into Makefile.boot, and comes up fine. Basic regression testing shows no issues right now.
I was also able to boot over network without issues.
I don't install uImage on a partition, rather, hand install it on SD card with DD, and then load with this:
bootcmd_mmc=run bootargs_base bootargs_mmc; mmc read 0 ${loadaddr} 0x800 0x1800;bootm
Just pulls from an offset in SD card. Works fine.
- The Freescale supplied SDK applies over 100 patches to the 8/09
release
of U-Boot; wondering how many made it into current version of U-Boot, and how much I should care.
Rather if they are not pushed to this ML, they cannot be integrated in the official releases. However, are you sure they are related to the i.MX51 ? Most of them are probably related to other processors.
I spot checked this; yes, a lot of patches for other processors. I'm going to spot check the key ones for MX51, and if I see needed installs (that are missing), will do, and provide a clean patch set to this ML (with comment tied back to the original FS patch set I found needs in).
End game:
- Get the Splash Screen working on imx.51 EVK.
As reference, take a closer look at the vision2 board. The IPU driver was ported from Freescale's 2.6.31 linux exactly for this goal. The splashimage is shown with the help of the "preboot" variable, because the image is stored on a device not directly addressable (SPI-Flash for vision2). It is the same for the mx51evk, because the image must be loaded (in raw mode or from a partition) from the SD card.
I will provide patch set back to mailing list once I do. I will derive from vision2 board.
There is already some work on this issue. A patchset was already sent to ML, but it requires changes to be included. You could use it as starting point ;-).
http://www.mail-archive.com/u-boot@lists.denx.de/msg41631.html
Technically, the actual IPU drive in u-boot supports only diu0 (required by the vision board). So changes are minimal in the IPU driver itself. However, please read the whole discussion on ML, so you can find which are the open points to be fixed.
Looked briefly at this list; thanks. I'm going to move forward now to get IPU support going on EVK with both display ports so that Splash Screen works on both.
I will post a clean patch set back to ML as I go on (or if I have trouble, explain what I am seeing). I'll try to keep my work clean, so it does not interfere with mainline development, possibly setting up environment variables to pick output channel.
Thanks again for fast response.
Regards,
tom