topic Re: Can Serial Downloader be triggered from uboot/userspace? in i.MX Processors

Can Serial Downloader be triggered from uboot/userspace?

dav1 — Thu, 29 Aug 2019 09:44:07 GMT

Is it possible (on the i.mx8 mini) to override the BOOT_MODE pins (via code/register write) to enable the Serial Downloader (without having to physically change the boot-pins)

Re: Can Serial Downloader be triggered from uboot/userspace?

art — Fri, 30 Aug 2019 08:45:34 GMT

No, it is not possible to override the BOOT_MODE[1:0] settings in software without physically switching the BOOT_MODE[1:0] pins.

Best Regards,

Artur

Re: Can Serial Downloader be triggered from uboot/userspace?

dav1 — Wed, 04 Sep 2019 13:24:29 GMT

Hi Artur,

iMX7's u-boot's bmode usb command writes to gpr9 and gpr10 (general purpose registers). The same register on the imx8m mini's reference manual states these are "reserved for internal use"...

Can you please check with the i.mx8 team if these still exists but are not documented.

Re: Can Serial Downloader be triggered from uboot/userspace?

art — Thu, 12 Sep 2019 11:28:36 GMT

The R&D have confirmed that there is no way to override the boot mode settings in software.

Re: Can Serial Downloader be triggered from uboot/userspace?

dav1 — Thu, 21 Nov 2019 01:03:10 GMT

FYI: fastboot can be used to override say emmc boot and instead jump into the serial-downloader mode.