Yes william The only way to support load kernel from usb stick , is from u-boot ,no adult about this .
2014/1/8 William Hermans <[email protected]> > Why would you boot a USB flash thumb drive ? > > The whole point at least in my own opinion is that a USB HDD is not as > write sensitive as flash memory media. Meaning you can write erase, write > erase to your hearts content and generally not have to worry that the media > may fail. So if you're doing a lot of development naively ( in stead of > cross compiling which i prefer ), you will not have to worry about the > media failing. > > As for the rest, we can sit and quibble about the various technicalities > all day long. But in the end, a BIOS, and uboot perform the same duties. > > > On Tue, Jan 7, 2014 at 8:13 PM, liyaoshi <[email protected]> wrote: > >> Actually , boot from USB ,as slave mode , as I know , iMX5/6 omap3/4/5 >> all support boot from usb otg (as slave mode ) >> >> >> 2014/1/8 William Hermans <[email protected]> >> >>> "So, what is the SD card? It can't just boot off the USB? I believe in >>> this case, I am still correct. " >>> >>> So, what is a BIOS ? If in this case you are correct, then no computer >>> system out there can boot off of USB. As all computer devices need to know >>> how to bring up the hardware, DDR memory( >>> now days ) , and from where to boot. >>> >>> Ok, so I was wrong, guess you do not care if someone can boot their >>> BBB's off of a USB drive. >>> >>> >>> On Tue, Jan 7, 2014 at 7:56 PM, William Hermans <[email protected]>wrote: >>> >>>> If you actually read the article, you would realize there is no need to >>>> modify anything rh_ . . . >>>> >>>> >>>> On Tue, Jan 7, 2014 at 7:56 PM, William Hermans <[email protected]>wrote: >>>> >>>>> >>>>> >>>>> On Tue, Jan 7, 2014 at 7:55 PM, William Hermans <[email protected]>wrote: >>>>> >>>>>> Actually, its loading the kernel from the HDD. Only the uboot files >>>>>> need be read, so as the device knows where to boot *from*. >>>>>> >>>>>> If you want to be a 100% nitpicking techno-junkie, then a purely 100% >>>>>> SD/eMMC-less boot can be had by using eprom . . . as it stands, this >>>>>> form >>>>>> of USB boot satisfies me, and 99% of the other people out there :) >>>>>> >>>>>> >>>>>> On Tue, Jan 7, 2014 at 7:13 PM, rh_ <[email protected]>wrote: >>>>>> >>>>>>> On Tue, 7 Jan 2014 16:18:00 -0600 >>>>>>> Gerald Coley <[email protected]> wrote: >>>>>>> >>>>>>> > Correct. It is actually booting form the SD and then loading off >>>>>>> the >>>>>>> > HDD. The boards cannot boot direct off of USB. They need that >>>>>>> > intermediate step. You could also use a large thumb drive like a >>>>>>> > 128GB. >>>>>>> >>>>>>> You are correct those instructions should be modifed to note the >>>>>>> reliance on >>>>>>> the sd card or eMMC. >>>>>>> >>>>>>> I recall that the lack of booting straight from USB was designed in >>>>>>> but I don't recall what the reason was. Do you know? It's common >>>>>>> for devices to boot from USB and I even recall reading USB was >>>>>>> checked >>>>>>> during the boot process, after SPI (I think). I may have read that >>>>>>> in the >>>>>>> TRM or is it SRM...? >>>>>>> >>>>>>> -- >>>>>>> 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/groups/opt_out. >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> -- >>> 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/groups/opt_out. >>> >> >> -- >> 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/groups/opt_out. >> > > -- > 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/groups/opt_out. > -- 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/groups/opt_out.
