topic Re: Bootelf on IMX6.UL in i.MX Processors

Bootelf on IMX6.UL

jiangshan_wei — Mon, 11 Mar 2019 05:43:08 GMT

hi，

Now I am using I.MX6UL development board named "i.MX6UltraLite Evaluation Kit (EVK)" . what i did is:

1: Install SDK_2.2_MCIM6UL on my PC.

2: Build one standalone elf executable file with demo IAR project in SDK folder “C:\nxp\SDK_2.2_MCIM6UL\boards\evkmcimx6ul\driver_examples\gpt\capture”.

2: press any key to stop auto-uboot, with uboot version "uboot-imx-imx_v2016.03_4.1.15_2.0.0_ga".

3: load elf file via command bootelf

=> fatload mmc 1:1 0x80800000 gpt_capture.out
reading gpt_capture.out
217948 bytes read in 35 ms (5.9 MiB/s)

4：Boot elf from memory.
=> bootelf 0x80800000

And my question is

1: Any idea why demo binary file execution is stuck? Assume application timer should start ticking.

2: How to disable interrupts initialized by U-boot? I mean how to diasble intterupts before bootelf command.

Thanks for the help in advance!

Re: Bootelf on IMX6.UL

jiangshan_wei — Tue, 12 Mar 2019 01:51:18 GMT

One more input, after bootelf is called by Uboot, then connect IAR and start debugging, there is a warning in debug log "Tue Mar 12, 2019 09:22:19: The stack pointer for stack 'IRQ_STACK' (currently 0x00000013) is outside the stack range (0x800111C0 to 0x800112C0) "

Re: Bootelf on IMX6.UL

Pavel — Tue, 12 Mar 2019 03:28:42 GMT

The i.MX6 u-boot is not operating system.

Find the "Standalone HOWTO:" in u-boot README file.

This file is available using the following link:

https://github.com/u-boot/u-boot/blob/master/README

Have a great day,
TIC

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Re: Bootelf on IMX6.UL

jiangshan_wei — Wed, 13 Mar 2019 02:04:42 GMT

hi Pavel,

thanks for the help, checked. Booting standalone application are directly runnable in the environment
provided by U-Boot. But now I also need to install my own set of exception handlers, device drivers, set up the MMU, etc... like linux OS， and i also need the leverage HAB feature on I.MX6UL processor.

Could you give me some advice about below items:

1: Is customizing U-boot the fastest approach？Any other better approach for that?

2: If customizing U-boot is the fastest approach, could you help to share some guide/doc about that？

thanks

Re: Bootelf on IMX6.UL

Pavel — Wed, 13 Mar 2019 03:39:02 GMT

Look at the following page. This page contains "Timer demo" example for using a CPM interrupt handler with the U-Boot code.

Re: Bootelf on IMX6.UL

jiangshan_wei — Wed, 13 Mar 2019 05:09:24 GMT

Appreciate the links, it helpful for me. May I have one more asking. Could you share the guide/link about relocating vector table for RTOS in DDR by booting with uBoot.

Re: Bootelf on IMX6.UL

jiangshan_wei — Thu, 14 Mar 2019 02:08:10 GMT

Let me clarify myself, I am looking for the method to replace Uboot exception handler with my ROTS exception handlers .Thanks

Re: Bootelf on IMX6.UL

Pavel — Fri, 15 Mar 2019 04:24:48 GMT

There are no recommendations from u-boot developers (www.denx.de) about similar u-boot changing.

It looks like that the following command sequence is needed.

Disable all interrupts
Replace exception handlers.
Enable interrupts.

Have a great day,
Pavel Chubakov

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Re: Bootelf on IMX6.UL

yali_zhang — Wed, 25 Sep 2019 08:35:00 GMT

Can you use the bootelf to start an application? Could you share your findings?