On Jan 24, 2015 10:56 PM, "liyaoshi" <liyao...@gmail.com> wrote: > > If I understand correctly > Boot rom dont care about the FAT table . its only read first several blocks > generally , MLO should be on the 2nd block ,1st block is MBR , > But if there is a FAT file system . 2nd block should be fat table , > 3nd block should be MLO > > whats my failed boot experience is when you format a sd card ,then copy a dummy file first ,then copy MLO to fat partiton > this will cause boot failed > > and if you try another way , fdisk from 10M an create only one ext4 partiton > dd if=MLO of=/dev/sdb bs=512 seek=2 > this still boot mlo ,but no u-boot.bin , this only because u-boot source code > > Actually , if you check QNX ipl source code , they dont need any FAT > > And if you really want a customed u-boot , > You can get it minimized lower than 64K and boot kernel directly
Mainline u-boot also doesn't require 'fat', on omap4+ you can also use ext, as long as mlo is copied first. For omap3 there isn't enough SRAM so it can be either fat or ext.... > > > 2015-01-24 3:40 GMT+08:00 Robert Nelson <robertcnel...@gmail.com>: >> >> > yup, i realize that now. is this behaviour documented somewhere in >> > an official TI am335x/omap4+ reference manual somewhere? >> >> It tis.. under "raw mode".. >> >> 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 beagleboard+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > > > -- > 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 beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
