Issues booting from BeagleBoneBlack with `root=/dev/mmcblk0p2`, data abort

[robamu]

I currently have problems getting the Beagle Bone Black booted with the root pointing to a rootfs on the SD card.

I initially tried to simply copy the ext4 rootfs on the host to the rootfs partition on the SD card and boot that one. It failed with the following output

=> fatload mmc 0:1 0x80200000 zImage
9609728 bytes read in 603 ms (15.2 MiB/s)
=> fatload mmc 0:1 0x80f00000 am335x-boneblack.dtb
62852 bytes read in 6 ms (10 MiB/s)
=> setenv bootargs console=ttyO0,115200n8 root=/dev/mmcblk0p2
=> bootz 0x80200000 – 0x80f00000
data abort
pc : [<9ff6c820>]	   lr : [<9ff6c8f5>]
reloc pc : [<80813820>]	   lr : [<808138f5>]
sp : 9df38cb8  ip : 00000000	 fp : 9df3c3e4
r10: 9ffc03d0  r9 : 9df38eb8	 r8 : 9ffc03cc
r7 : 00000002  r6 : 9df3c3d0	 r5 : 82000000  r4 : 9ffc0334
r3 : 56190527  r2 : 9df3c3d1	 r1 : 00000002  r0 : 00000000
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32
Code: ffdaf7ff f85db003 0000fb04 4b0ab510 (46046802) 
Resetting CPU ...

I then tried to follow the instructions in the book exactly, using
format-sd-card.sh to set up the SD card, copying the bootloader to boot,
and then generating rootfs.ext2 with

genext2fs -b 16384 -d initramfs -D device-table.txt -U rootfs.ext2

and finally sudo dd if=rootfs.ext2 of=/dev/<rootfspartition> to flash the rootfs partition, but I get the same issue with a data abort. Does anyone have an idea what might cause this?

If I run

fatload mmc 0:1 0x80200000 zImage
fatload mmc 0:1 0x80f00000 am335x-boneblack.dtb
fatload mmc 0:1 0x81000000 uRamdisk
setenv bootargs console=ttyO0,115200n8 rdinit=/sbin/init
bootz 0x80200000 0x81000000 0x80f00000

I can boot the kernel from the initramfs in uRamdisk without issues, so I assumed that the Linux kernel image and the *.dtb file are not the issue

[amahran]

you have a copy-paste issue with the hyphen in the command bootz 0x80200000 – 0x80f00000 it should be bootz 0x80200000 - 0x80f00000.

you might also need to add rootwait argument to the bootargs not to end up in kernel panic. setenv bootargs console=ttyO0,115200 root=/dev/mmcblk0p2 rootwait