On Fri, Feb 13, 2015 at 8:16 AM, Marco Cavallini cavallini.koan@gmail.com wrote:
I have already studied this useful document http://www.denx.de/wiki/pub/U-Boot/MiniSummitELCE2013/2013-u-boot-mxs-withou...
I do not need any encryption. I did exactly the same as explained here http://www.denx-cs.de/doku/?q=m28evkrunuboot
make u-boot.sb
Then I do not have SD nor other storage so I mus use USB firmware upload http://www.denx-cs.de/doku/?q=m28evkusbdownloader
Load u-boot.sb onto the device: sudo ./mxsldr <path to u-boot.sb>
This procedure works perfectly on the i.MX28evk, but doesn't on my custom board so I supposed that u-boot-2015.01 STL works perfecly on i.MX28 and MfgTools upload.
Differences are:
- DUART on alternate pins
- DDR different
- eMMC instead of NAND
I don't know how i.MX28 ROM boot works so my question are:
- should I see something on the serial port BEFORE the DDR settings are done?
- if I put some code in mxs_common_spl_init() is this executed
immediately BEFORE the DDR (and power) settings are done?
You could try this patch to have debug output from SPL: http://git.denx.de/?p=u-boot.git;a=commitdiff;h=950eaf6230496585e72ebb965c45...
Make sure you have DEBUG and CONFIG_SPL_SERIAL_SUPPORT enabled.
Also, double check the DDR initialization for your board.
Regards,
Fabio Estevam