AMD Motherboards - B450M Pro4-F, SPI flash header J1

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B450M Pro4-F, SPI flash header J1

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=18967
Printed Date: 08 Aug 2025 at 8:46pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B450M Pro4-F, SPI flash header J1

Posted By: pc2005
Subject: B450M Pro4-F, SPI flash header J1
Date Posted: 27 May 2021 at 6:37pm

Hello, I've recently got a new B450M Pro4-F board with Ryzen 3600. I'm planning to upgrade to more powerful ryzen in the future and eventually to install coreboot when it gets Ryzen support.

Because of this I will probably need to reflash BIOS often. I've found there is SPI flash chip related header "J1" on the board (9 pin, next to the chip). Can I get pinout of this header? I was able to measure 8 pins which go straight to the chip, but there is 1 more, which seems to be connected to ground via 17 ohm resistance. Is this pin necessary for the operation?

https://imgur.com/iEZdrJL" rel="nofollow - J1 header location