i.MX ProcessorsのトピックRe: Sharing boot_cfg lines

Sharing boot_cfg lines

jautry — Wed, 15 Sep 2021 00:32:57 GMT

I noted on the eval board that Boot-Cfg input lines to the processor MIMXRT 1062 were shared. Is it possible to share these lines since they are only accessed at startup for config data? Is the way to do this is to start with them configured for Boot-Cfg and after boot changing the line configuration?

Re: Sharing boot_cfg lines

Yuri — Wed, 15 Sep 2021 03:46:40 GMT

@jautry
Hello,

Section 9.4.2 (GPIO boot overrides) of the RM contains information about the boot override pins.

https://www.nxp.com/webapp/Download?colCode=IMXRT1060RM

After boot these pins can be used for other functionality.
Use i.MX Pins tool for possible configurations.

https://www.nxp.com/pages/pins-tool-for-i.mx-application-processors:PINS-TOOL-IMX

Regards,
Yuri.

Re: Sharing boot_cfg lines

jautry — Wed, 15 Sep 2021 13:18:54 GMT

I just want to make sure. The config tool lists the GPIO as the default at power up but not the config option. So the default is actually the config option for reading the boot configs and then the mux is executed to direct the pins to proper configuration. We do not have to specifically define the pin for config option.

Re: Sharing boot_cfg lines

Yuri — Thu, 16 Sep 2021 04:41:40 GMT

@jautry
Hello,

The default pins state are configured after boot configuration is latched.

Regards,
Yuri