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Re: "external abort on linefetch (0x814)" on Kirkwood 6282 SoC

On Sat, 2018-06-02 at 15:36 +0300, Timo Jyrinki wrote:
> 2018-05-28 19:00 GMT+03:00 Andrew Lunn <andrew@lunn.ch>:
> > Could you try changing "Memory split" to "3G/1G user/kernel split
> (for
> > full 1G low memory)". You should then see that the lowmem in the
> > Virtual kernel memory layout table goes from starting at 0xc0000000
> to
> > starting at 0xB0000000. I hope it will then not use high mem, and
> > still give you the full 1G of RAM.
> Someone could give newbie tips on making a bootable kernel that I
> could load from u-boot. I tried compiling one Debian's kernel simply
> with debuild in a stretch chroot, adding VMSPLIT_3G_OPT=y to
> config.marvell under debian/, but with the vmlinuz generated I got
> "Bad Magic Number" when I tried to load it with u-boot over TFTP.

You need to append a dtb and then encode in u-boot's uImage format.

   cat arch/arm/boot/zImage arch/arm/boot/dts/kirkwood-ts419-6281.dtb > x
   sudo mkimage -A arm -T kernel -O linux -C none -a 0x8000 -e 0x8000 -d x uImage

Now the uImage file ought to be bootable with `bootm`, load it to
0x800000 and an initrd (if using one) to 0xa00000  then `bootm

Be sure to pick the correct dtb variant for your board, it might boot
with the wrong one but you'll potentially be missing some peripherals

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