On 31.01.2012 15:25, Sergey Lapin wrote: > On Tue, Jan 31, 2012 at 03:03:55PM +0100, Matthias Fuchs wrote: >> Hi, >> >> I have a problem booting the current u-boot-imx version >> on a MX28EVK via USB. The i.MX28 CPU supports a special boot mode >> where the image (sb boot stream) is downloaded via USB device >> (all DIP switches in position 'off' on the EVK). The >> CPU's internal bootrom implements a HID device in this mode. >> Freescale provides a download tool "sb_loader" for this purpose. >> There is also a GPL'd implementation based on libusb. > Could you please provide link to GPL tool? check http://svn.rockbox.org/viewvc.cgi/trunk/utils/imxtools/
The code builds fine against a recent version of libusb. I tested it against the mx28evk. >> >> So back to my problem: >> >> I build u-boot from the u-boot-imx repository. This runs fine >> when booting from SD/MMC or SPI-flash. But the console stays dark >> when using the USB download mode. USB download works fine with the >> Freescale provided U-Boot sources together with the imx-bootlets >> SPL code. >> >> Now I digged a little bit deeper to find out the cause: >> >> When downloading via USB I saw the SPL running correctly. >> board_init_ll() (arch/arm/cpu/arm926ejs/mx28/start.S) runs through >> correctly. Then control is passed back to the bootrom. That's >> where things end as far as I can see. >> >> The 2nd stage of u-boot is not started. >> >> The USB boot mechanism is not documented that detailed. >> Is it possible that the SPL code overwrites the bootroms ivt and >> in consequence crashes the bootrom's USB code? Any further ideas? > I'd look at difference in linking scripts and addresses in > freescale u-boot and new u-boot. > This might be some memory addressing issues. Had some of this with > i.MX23. Also, some hardware might be not powered on or is powered > off by SPL. That's a good catch. I will check Fabio's idea in just a minute. Matthias _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
