Re: How to debug u-boot data abort

From: Abder <koute102030@gmail.com>
To: qianfan <qianfanguijin@163.com>
Cc: U-Boot Mailing List <u-boot@lists.denx.de>
Subject: Re: How to debug u-boot data abort
Date: Wed, 23 Mar 2022 08:51:58 +0100	[thread overview]
Message-ID: <CAHaxFpgjc7JxjhNfedkpk7TZFyYh0Vm=NhuK2hgoUSpMqT2pQg@mail.gmail.com> (raw)
In-Reply-To: <7536b9e1-de7a-a492-6951-485d4eb75df1@163.com>

Le mer. 23 mars 2022 à 03:28, qianfan <qianfanguijin@163.com> a écrit :
>
> 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@4a100000: addr 0
> eth2: ethernet@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 ...
>
Don't have any idea on what is causing the crash,  but to answer your
question about debugging data abort :
from the reg dump, you can look at the PC and LR registers to see the
function that caused the crash (in PC) and its caller (in LR) by using
the .map file (generated after compilation).
use the values of pc and lr ante relocation (the 2nd ligne in the dump
above: reloc pc ...)

Regards
--
Abder

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