Typo in last email, I used "mem=256M", not "mem=256MB"
On Tue, Jun 9, 2015 at 9:03 AM, Edward Wingate <edwinga...@gmail.com> wrote: > Thanks, Nathan, for your help. It worked, with a little oddity I don't > understand. > > In my uEnv.txt, I set both fdt_high and initrd_high to 0x10000000 and > fdt/initrd are now loaded to 1st 256 MB: > Loading Kernel Image ... OK > Loading Ramdisk to 0f44c000, end 0ffff2f2 ... OK > Loading Device Tree to 0f443000, end 0f44bf40 ... OK > > However, with bootarg "mem=256MB", the kernel doesn't boot. > With "mem=257M", it does: > > /proc/iomem: > 00000000-100fffff : System RAM > 00008000-00584b03 : Kernel code > 005b6000-0061d5df : Kernel data > > I'd be OK with this, but just want to understand why I can't specify > mem=256M? I could probably also lower initrd_high and fdt_high a bit > more to make mem=256M work, but why would that be necessary? > > Also, in the device tree entry for memory, should I leave "reg = <0x0 > 0x20000000>" or change that to reflect 256MB? Changing it to "reg = > <0x0 0x10000000>" didn't seem to have any effect. The mem bootarg > seems to be the thing that actually works to limit the amount of > memory Linux sees. > > > On Mon, Jun 8, 2015 at 9:45 PM, Nathan Rossi <nat...@nathanrossi.com> wrote: >> On Tue, Jun 9, 2015 at 4:06 AM, Edward Wingate <edwinga...@gmail.com> wrote: >> >> Those values are generated via u-boot based on the value of fdt_high >> and initrd_high which are set in the u-boot environment. (At least for >> Zynq) >> >> If you have a look at the default environment you will see them set to >> 0x20000000: >> http://git.denx.de/?p=u-boot.git;a=blob;f=include/configs/zynq-common.h;h=1a52e7d538261a9d36b078d61e00e60bf8918227;hb=HEAD#l217 >> >> You can override those environment variables with your uEnv.txt file, >> setting it to 0x10000000 will make sure they fdt/initrd is loaded into >> the first 256M. >> >> Regards, >> Nathan >> -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto