RTEMS Fatal Error on IMX7D SABRE Board.

Wed Jan 6 13:31:49 UTC 2021

Hello,

I checked this again. Thank you very much.

Because I used imx7d-sdb.dtb file from u-boot\arch\arm\dts, there was a problem for initializing general timer.

As soon as I have update for testing MX7D SABRE board, I will let you know that.

Best Regards,
JunBeom

-----Original Message-----
From: Christian Mauderer <oss at c-mauderer.de> 
Sent: Wednesday, January 6, 2021 6:24 PM
To: jameszxj <jameszxj at gmail.com>; JunBeom Kim (EmbedCoreTech) <jbkim at e-coretech.kr>; 'users' <users at rtems.org>
Subject: Re: RTEMS Fatal Error on IMX7D SABRE Board.

Hello,

On 06/01/2021 10:04, jameszxj wrote:
> Hi,
> 
> I can't find "timer" node in your devicetree. 
> Function arm_generic_timer_get_config() in file bspstart.c will find 
> node "/timer"
> and get "clock-frequency" value for system tick.

note that at least the clock-frequency is added by U-Boot on the i.MX7 during boot and is not in the typical device tree sources.

On i.MX6UL/ULL there is still an ugly hack necessary:

https://github.com/grisp/rtems/commit/02270d5ec82684007ae9973070a6f29428be1543

It's on my TODO-list to avoid that patch, but I haven't done that yet.

> 
> ------------------ Original ------------------
> *From:* "JunBeom Kim (EmbedCoreTech)" <jbkim at e-coretech.kr>;
> *Date:* Wed, Jan 6, 2021 04:46 PM
> *To:* "'jameszxj'"<jameszxj at gmail.com>;"'users'"<users at rtems.org>;
> *Subject:* RE: RTEMS Fatal Error on IMX7D SABRE Board.
> 
> Dear James,
> 
> As I know before, because this BSP is tested on Phytec’s 
> PhyBOARD-i.MX7 board, I am considering to purchase this board, too.

The last test on that board is some time back because I currently don't have access to it (working from home). So also I would hope it, I wouldn't guarantee that it runs out of the box.

> 
> Best Regards,
> 
> JunBeom
> 
> *From:*JunBeom Kim (EmbedCoreTech) <jbkim at e-coretech.kr>
> *Sent:* Wednesday, January 6, 2021 5:39 PM
> *To:* 'jameszxj' <jameszxj at gmail.com>; 'users' <users at rtems.org>
> *Subject:* RE: RTEMS Fatal Error on IMX7D SABRE Board.
> 
> Dear James,
> 
> I used two files(imx7d-sdb.dts and imx7d.dtsi) for making imx7d-sdb.dtb.
> 
> There is clock-frequency configuration in imx7d.dtsi.
> 

Again: Normally U-Boot should add that clock-frequency.

> Best Regards,
> 
> JunBeom
> 
> *From:*users <users-bounces at rtems.org 
> <mailto:users-bounces at rtems.org>> *On Behalf Of *jameszxj
> *Sent:* Wednesday, January 6, 2021 4:13 PM
> *To:* users <users at rtems.org <mailto:users at rtems.org>>
> *Subject:* Re:RTEMS Fatal Error on IMX7D SABRE Board.
> 
> Hi,
> I use IMX7 bsp on my imx6ull board. I have encountered maybe the same 
> problem. Please check your device-tree, BSP needs "clock-frequency" at 
> node "timer".

Do you use an i.MX6ULL with U-Boot or Barebox? They might have slightly different behavior regarding the timer.

> 
> But I encountered another problems, theARMv7-AR Generic Timercan not 
> generate interrupt.
> imx7d has the same core with imx6ull，if your board run RTEMS 
> successfully, please let me know, thanks.

As you might have seen above, I'm using the BSP on i.MX6ULL based boards. The board uses Phytec Phycore i.MX6UL/ULL modules (different variants in different projects). One of the projects is an open source one and you can find all sources at:

     https://github.com/grisp/grisp2-rtems-toolchain

> 
> ------------------ Original ------------------
> 
> *From:*"JunBeom Kim (EmbedCoreTech)" <jbkim at e-coretech.kr 
> <mailto:jbkim at e-coretech.kr>>;
> 
> *Date:*Wed, Jan 6, 2021 01:05 PM
> 
> *To:*"users"<users at rtems.org <mailto:users at rtems.org>>;
> 
> *Subject:*RTEMS Fatal Error on IMX7D SABRE Board.
> 
> Hello,
> 
> After I purchased i.MX7D SABRE board, I am trying to test RTEMS kernel 
> using lastest RTEMS kernel and source builder for RTEMS 6.0
> 
> As I knew before, RTEMS BSP for i.MX7D was not tested for i.MX7D SABRE 
> board.
> 
> When I tested this, my testing result is in below; <REMARK> rtems.img 
> is made by calling mkimage.
> 
> At this time, I am trying to debug RTEMS BSP using GDB with J-Link probe.
> There is problem for executing start.S assembly code as source code level.

Can you try to set a breakpoint on at least _Terminate and do a backtrace (bt in gdb)? I think the _ARM_Exception_default could be a useful one too.

Best regards

Christian

> 
> Please advise me.
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> U-Boot 2020.10 (Jan 05 2021 - 09:44:38 +0900)
> 
> CPU:Freescale i.MX7D rev1.3 1000 MHz (running at 792 MHz) 
> CPU:Commercial temperature grade (0C to 95C) at 38C Reset cause: POR
> Model: Freescale i.MX7 SabreSD Board
> Board: i.MX7D SABRESD in non-secure mode
> DRAM:1 GiB
> PMIC: PFUZE3000 DEV_ID=0x30 REV_ID=0x11
> MMC:FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2 Loading Environment from 
> MMC... *** Warning - bad CRC, using default environment
> 
> Video: 480x272x24
> In:serial
> Out:serial
> Err:serial
> Hit any key to stop autoboot:0
> 
> => fatload mmc 0 0x80800000 rtems.img
> 36463 bytes read in 23 ms (1.5 MiB/s)
> 
> => fatload mmc 0 0x83000000 imx7d-sdb.dtb
> 33369 bytes read in 22 ms (1.4 MiB/s)
> 
> => bootm 0x80800000 - 0x83000000
> ## Booting kernel from Legacy Image at 80800000 ...
> Image Name:RTEMS
> Image Type:ARM Linux Kernel Image (gzip compressed) Data Size:36399 
> Bytes = 35.5 KiB Load Address: 80200000 Entry Point:80200000 Verifying 
> Checksum ... OK ## Flattened Device Tree blob at 83000000 Booting 
> using the fdt blob at 0x83000000 Uncompressing Kernel Image Using 
> Device Tree in place at 83000000, end 8300b258
> 
> Starting kernel ...
> 
> 
> *** FATAL ***
> fatal source: 6 (RTEMS_FATAL_SOURCE_BSP) fatal code: 3072 (0x00000c00) 
> RTEMS version: 6.0.0 RTEMS tools: 10.2.1 20201222 (RTEMS 6, RSB 
> d3dc0bc3861362978cdf65725e4ba2b64e283d32, Newlib 415fdd4) Executing 
> thread is NULL ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Best Regards,
> JunBeom Kim
> 
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