How to debug u-boot data abort

[qianfan]

Hi:

I had a custom AM335X board connected my computer by usbnet. It always report 
data abort when 'dhcp':

Next it the log:

U-Boot 2022.01-rc1-00183-gfa5b4e2d19-dirty (Feb 25 2022 - 15:45:02 +0800)

CPU  : AM335X-GP rev 2.1
Model: WISDOM AM335X CCT
DRAM:  512 MiB
NAND:  256 MiB
MMC:   OMAP SD/MMC: 0
Loading Environment from NAND... *** Warning - bad CRC, using default environment

Net:   Could not get PHY for ethernet at 4a100000: addr 0
eth2: ethernet at 4a100000, eth3: usb_ether
Hit any key to stop autoboot:  0
=> setenv autoload no
=> dhcp
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
musb-hdrc: peripheral reset irq lost!
high speed config #2: 2 mA, Ethernet Gadget, using RNDIS
USB RNDIS network up!
BOOTP broadcast 1
BOOTP broadcast 2
BOOTP broadcast 3
DHCP client bound to address 192.168.200.4 (757 ms)
data abort
pc : [<9fe9b0a2>]          lr : [<9febbc3f>]
reloc pc : [<808130a2>]    lr : [<80833c3f>]
sp : 9de53410  ip : 9de53578     fp : 00000001
r10: 9de5345c  r9 : 9de67e80     r8 : 9febbae5
r7 : 9de72c30  r6 : 9feec710     r5 : 0000000d  r4 : 00000018
r3 : 3fdd8e04  r2 : 00000002     r1 : 9feec728  r0 : 9feec700
Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32 (T)
Code: f023 0303 60ca 4403 (6091) 685a
Resetting CPU ...

resetting ...


It's there has any doc about how to debug data abort? Or is the bug is already 
fixed?

Thanks