i.MX6UL: U-boot 2018.03 instability issue

[Michael Nazzareno Trimarchi]

Hi

On Fri, Jun 18, 2021 at 6:49 PM Sean Anderson <sean.anderson at seco.com> wrote:
>
>
>
> On 6/18/21 6:17 AM, Rosario Borsellino wrote:
>  > Hello everyone,
>  >
>  > This is the first time that I request help on a mailing list so tell me if I make anything wrong.
>  >
>  > I'm having hard time trying to debug an issue on U-boot 2018.03, built for a custom i.MX6UL platform.
>
> Does this occur with 2021.04?
>
>  >
>  > During the porting from U-boot 2015.04, as I need to display a splashcreen, I enabled the CONFIG_VIDEO property (alongside with the required initializations on my board sources). This made the work (I can see the default DENX splash on video) but made the U-boot unstable.
>  >
>  > As an example, if I run any fdt command from the shell, U-boot hangs with a data abort. Here the printout:
>  >
>  > ...
>  > => setenv loadfdt tftpboot ${fdtaddr} ${serverip}:${fdtfile}
>  > => setenv fdtaddr 0x83000000
>  > => setenv fdtfile rb/imx6ul-dave-devel.dtb
>  > => setenv serverip 192.168.0.13
>  > => setenv ipaddr 192.168.0.83
>  > => run loadfdt
>  > Using FEC0 device
>  > TFTP from server 192.168.0.13; our IP address is 192.168.0.83
>  > Filename 'rb/imx6ul-dave-devel.dtb'.
>  > Load address: 0x88000000
>  > Loading: ########
>  >           1.2 MiB/s
>  > done
>  > Bytes transferred = 38141 (94fd hex)
>  > => fdt addr ${fdtaddr}
>  > => fdt print /cb
>  > data abort
>  > pc : [<8ff460c0>]          lr : [<8ff4c2c9>]
>  > reloc pc : [<878000c0>]    lr : [<878062c9>]
>
> What functions/lines are these? You can use objdump -S and grep for the
> reloc pc and lr (or look at u-boot.map, but that will not give you line
> numbers)

bdinfo

I don't have know a board switch on but the tftp load at 0x8800000 and
your fdtaddr is 0x8300000

Michael


Michael
>
> --Sean
>
>  > sp : 8df45cf8  ip : 00000000     fp : 00000003
>  > r10: 8df50cd8  r9 : 8df45eb0     r8 : 00000003
>  > r7 : fffffff5  r6 : 00000020     r5 : 00000000  r4 : 8ffbf514
>  > r3 : 00000001  r2 : 0000894c     r1 : 000000d8  r0 : fffffff5
>  > Flags: nzcv  IRQs on  FIQs on  Mode SVC_32
>  > Resetting CPU ...
>  >
>  > resetting ...
>  >
>  > U-Boot SPL 2018.03-munich-2.0.0-rc4 (Jun 18 2021 - 09:16:52 +0200)
>  > ...
>  >
>  > But the instability is not only related to these commands (I use this as a PASS/FAIL test), so I don't either know where to check.
>  >
>  > Debugging via JTAG, with Trace32 tool, I can make the command print the requested node, but only if I run step-by-step.
>  >
>  > I found that CONFIG_VIDEO property enables by default the CONFIG_CONSOLE_MUX property, disabling the latter the fdt test pass.
>  >
>  > Has anyone ever seen this behaviour and can address me to find the root cause?
>  >
>  > I'm working on top of NXP stable branches, so I don't know if I can find help here. I also enbled the SPL build which is not officially supported by NXP. Let me know what printouts, code snippet or test to perform I need to share to help in the identification of the problem.
>  >
>  > Best regards,
>  >



-- 
Michael Nazzareno Trimarchi
Co-Founder & Chief Executive Officer
M. +39 347 913 2170
michael at amarulasolutions.com
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