https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 23 Apr 2026 01:59:36 +0000 Thu, 31 Oct 2019 11:23:17 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=12770 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69502&title=ryzen-3000-rdrand-microcode-bug#69502 Author: shmerl
Subject: 12770
Posted: 31 Oct 2019 at 11:23am

On Linux you can also explicitly load latest microcode, even if motherboard firmware still ships the old one: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amd-ucode

]]> Thu, 31 Oct 2019 11:23:17 +0000 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69502&title=ryzen-3000-rdrand-microcode-bug#69502 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69497&title=ryzen-3000-rdrand-microcode-bug#69497 Author: ncc1701z
Subject: 12770
Posted: 31 Oct 2019 at 3:25am

You would be right, that should've been the case.
Except the mainboard in the article didn't get the fix even now.
Granted, it's a rather niche board (Asrock Rack X470D4U), but that situation shouldn't happen.

Oh well, maybe it's just a special case and I'm just being paranoid ]]> Thu, 31 Oct 2019 03:25:48 +0000 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69497&title=ryzen-3000-rdrand-microcode-bug#69497 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69479&title=ryzen-3000-rdrand-microcode-bug#69479 Author: Ray62
Subject: 12770
Posted: 30 Oct 2019 at 6:03am

These problems are fixed since over two months.
Since "AMD AGESA Combo-AM4 1.0.0.3 ABB" the RDRAND problem is fixed (for Linux systemd and Destiny 2 on Windows, but also for all SW using the RDRAND instruction).
So a bios must contain at least this AGESA version, which should be the case for all consumer/mainstream boards from Asrock supporting Zen2 CPUs.
]]> Wed, 30 Oct 2019 06:03:29 +0000 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69479&title=ryzen-3000-rdrand-microcode-bug#69479 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69478&title=ryzen-3000-rdrand-microcode-bug#69478 Author: ncc1701z
Subject: 12770
Posted: 30 Oct 2019 at 5:28am

Just now I read about a microcode bug here:
https://arstechnica.com/gadgets/2019/10/how-a-months-old-amd-microcode-bug-destroyed-my-weekend/

As it turns out, Ryzen 3000 series shipped with a broken random number generator. It gives you a 0xFFFFFFFF for the "random" number, every single time. For some systems (especially Linux) it made them unable to boot. Destiny 2 on Windows also can't run because of it.

Apparently it should've been fixed with a BIOS update, but it seems not to be the case even today. Article explained how to check if your system is affected, but it required Linux.

For anyone willing to do the check and share their results, I am grateful.
I hope ASRock had this problem fixed.]]> Wed, 30 Oct 2019 05:28:21 +0000 https://forum.asrock.com/forum_posts.asp?TID=12770&PID=69478&title=ryzen-3000-rdrand-microcode-bug#69478