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Kiamur's avatar
Kiamur
Icon for New Contributor rankNew Contributor
7 years ago

Cyclone V pin assignment from bootloader - how

I look for a way to set the weak pull-up resistor on a HPS pin (UART0_RX) to 'on' from the bootloader, before Linux boot and before an FPGA configuration is loaded to the device. The general questio...
FawazJ_Altera's avatar
FawazJ_Altera
Icon for Frequent Contributor rankFrequent Contributor
7 years ago

Hello,

You can use Quartus prime pin planner, select the pull-up settings you need to apply for that UART, compile Quartus, this will generate the handoff files with the new applied pull-up. After that boot the system, uboot will configure the FPGA and apply all the pins settings before linux boots.