i.MX ProcessorsのトピックRe: Change to Serial download mode on uboot for MFG Tool

Change to Serial download mode on uboot for MFG Tool

aravinthkumarja — Mon, 03 Apr 2017 14:03:59 GMT

Hi All,

I'm using Android 6.0.1, Without using boot switch how can i change to serial download mode for MFG Tool flash.

Regards,

Aravinth

Re: Change to Serial download mode on uboot for MFG Tool

Yuri — Tue, 04 Apr 2017 06:56:13 GMT

Hello,

If You have removable boot device (SD card, for example) - the simplest

way to enter i.MX6 serial boot mode is just removing the boot media (assuming boot

options are not changed, and are set, say, for SD boot ).

In such case, because of boot error, i.MX6 boot ROM enters serial boot mode automatically.

Have a great day,

Yuri

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Re: Change to Serial download mode on uboot for MFG Tool

aravinthkumarja — Tue, 04 Apr 2017 08:32:55 GMT

Hi Yuri,

Thanks for your reply. Now i'm using only eMMC, i don't have SD option. So what i can do.?

Regards,

Aravinth

Re: Change to Serial download mode on uboot for MFG Tool

Yuri — Tue, 04 Apr 2017 10:13:59 GMT

Hello,

I am afraid in eMMC case it is needed to use the boot switches.

Regards,

Yuri.

Re: Change to Serial download mode on uboot for MFG Tool

aravinthkumarja — Tue, 04 Apr 2017 10:39:20 GMT

Hi Yuri,

In uboot we have any commands to change into serial download mode.

I think old version of uboot have download_mode command, by using this we can use MFG tool without boot switch. but latest uboot it's not there.

Any other commands are there to go to serial download mode option on uboot.

Regards,

Aravinth

Re: Change to Serial download mode on uboot for MFG Tool

BiyongSUN — Wed, 05 Apr 2017 05:42:44 GMT

new uboot has bmode command

Re: Change to Serial download mode on uboot for MFG Tool

Yuri — Thu, 06 Apr 2017 05:18:06 GMT

Yes, but on my i.MX6 UL EVK the command "bmode usb" just performs reset :-(

~Yuri.

Re: Change to Serial download mode on uboot for MFG Tool

aravinthkumarja — Thu, 06 Apr 2017 13:44:22 GMT

I'm using i.MX6Q, It's working fine.

Thanks BiyongSUN‌ YuriMuhin_ng‌

Regards,

Aravinth

Re: Change to Serial download mode on uboot for MFG Tool

amigen-jason — Fri, 05 Mar 2021 03:26:12 GMT

In case anyone is wondering how to enter serial downloader mode from U-Boot without altering the BOOT_MODE pin selections, I dug around and found that there are some undocumented registers that can do this. For me, the bmode usb command was not a valid U-Boot command as it's only support on some i.MX6 and i.MX6 platforms and I'm on a i.MX 8M Mini (imx8mm). Following the U-Boot code for how it works on an i.MX6 platform (which is very similar to i.MX8) I've found a working solution.

u-boot=>nm.l 30390098

30390098: 00000000 ? 40000000

30390098: 40000000 ? .

u-boot=> reset

resetting ...

The part will reset and enter serial downloader mode. Super useful.

Re: Change to Serial download mode on uboot for MFG Tool

siva_prabhakara — Mon, 28 Jun 2021 15:56:48 GMT

@amigen-jason did you mean this worked on imx8mm too? Are you using usb1 for otg?

Re: Change to Serial download mode on uboot for MFG Tool

amigen-jason — Mon, 28 Jun 2021 16:06:22 GMT

Yes, it works for me on the imx8mm (i.MX 8M Mini). It does not work on a imx8mp (i.MX 8M Plus), and I suspect it would work on a imx8mn (i.MX 8M Nano).

The USB SDP only works on USB0. Unrelated to SDP, I have successfully used USB0 and USB1 as device gadgets in Linux. I have not tested host mode or otg.

Re: Change to Serial download mode on uboot for MFG Tool

siva_prabhakara — Mon, 28 Jun 2021 16:12:37 GMT

@amigen-jason

thanks for the reply, unfortunately we have usb2 configured for device/otg/host modes, we use usb1 for something else.

i bumped across a spl kconfig "SPL_SDP_USB_DEV", wonder if i can change this to use usb2 instead.

config SPL_SDP_USB_DEV
int "SDP USB controller index"
default 0
depends on SPL_USB_SDP_SUPPORT
help
Some boards have USB controller other than 0. Define this option
so it can be used in compiled environment.
endif

Re: Change to Serial download mode on uboot for MFG Tool

amigen-jason — Mon, 28 Jun 2021 16:40:10 GMT

Sorry, I'm too used to counting from 0. The imx8mm has two USB OTG capable ports: USB OTG1 and USB OTG2.

SDP can only only be used with USB OTG1--that's a function of the boot capability of the part and documented in the boot chapter of the reference manual. There's nothing you can change in U-Boot to change this as it is intrinsic to the part. If there was a setting, it would have to be a fuse or something because SDP relates to how the part boots, prior to running any software you'd be able to configure.