https://github.com/ungureanuvladvictor/BBBlfs
look at this to see how to boot via USB. On Thursday, January 15, 2015 at 8:54:06 AM UTC+1, [email protected] wrote: > > hi > > According to Silicon Errata SPRZ360 section 3.1.3 Boot: > > USB Boot ROM Code Uses Default DATAPOLARITY .The AM335x USB PHYs supports > a DATAPOLARITY feature that allows the data plus (DP) and data minus (DM) > data signals to be swapped. This feature was added to simplify PCB > layout.In some cases, the DP and DM data signals may need to cross over > each other to connect to the respective USB connector pins. Crossing these > signals on the PCB may cause signal integrity issues if not implemented > properly since they must be routed as high-speed differential transmission > lines. The DATAPOLARITY feature in the USB PHYs can be used resolve this > issue.The DATAPOLARITY feature is controlled by DATAPOLARITY_INV (bit 23) > of the respective USB_CTRL register. > The USB boot ROM code uses the default value for DATAPOLARITY_INV when > booting from USB. Therefore, the PCB must be designed to use the default > DATAPOLARITY if the system must support USB boot > > > > How Beagle bone black is designed . is this considered in the design ? > > On Wednesday, January 14, 2015 at 9:53:07 PM UTC+5:30, RobertCNelson wrote: >> >> On Wed, Jan 14, 2015 at 7:00 AM, <[email protected]> wrote: >> > How we can load the MLO and U-BOOT in beaglebone black though USB port? >> I >> > know it can be done by SD card/serial port and it will load to eMMC >> but if >> > I have a USB stick/External HDD/USB connected to host, how can MLO and >> UBOOT >> > be fetch through USB port and able transfer directly to eMMC. >> > >> > Once these are done and we get the UBOOT prompt, we can surely upload >> the >> > kernel image to any of the known memory interfaces . >> >> Well... It's not 100% of what you want.. but close.. >> >> First flash this "console" eMMC flasher: >> >> >> http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#BBB_.28All_Revs.29_eMMC_Flashers >> >> >> After flashing has finished, remove microSD... >> >> From u-boot: >> >> ums 0 mmc 1 >> >> Now you can flash the "eMMC" thru usb the port.. (thanks to u-boot) >> >> Regards, >> >> -- >> Robert Nelson >> http://www.rcn-ee.com/ >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
