Enabling pull up in Xaiver NX

dear sir
how to config gpio3(pin126) as pull up,which need to modify uboot?Is there any guide or document,tks

hello dgw_1985,

according to NX and Xavier Boot Flow, u-boot has already removed.
please access Pinmux spreadsheets from download center, please have customization to modify the pin state; you may also check Nano’s application note for the reference of pinmux configuration.