While I haven’t been able to hack back the AMD CBS menu into the BIOS I have discovered some potential solutions. I’ll share my findings in this post so you can give it a try.

There are two modules in the BIOS containing the AMD CBS menu. They’re both called AmdSetup and are located in CbsSetupDxeRV and CbsSetupDxeRN. The only one that contains ACS Enable is CbsSetupDxeRV and it does not appear to be included with the BIOS when it’s flashed.

The only options we have access to are located in the NBIO Common Options sub menu in CbsSetupDxeRN. Please note these offsets only apply to X3MSTX_1.70.

IOMMU                Name=AmdSetup VarOffset=0xC9   Disabled=0x0, Enabled=0x1, Auto=0xF (default)
PCIe ARI Support     Name=AmdSetup VarOffset=0x14D  Disabled=0x0, Enabled=0x1, Auto=0xF (default)
PCIe ARI Enumeration Name=AmdSetup VarOffset=0x1A7  Disabled=0x0, Enabled=0x1, Auto=0xF (default)

We can edit the UEFI variables using a tool called RU.efi:

1. Format a USB disk to FAT32 and install GRUB2 on it
   a. Linux (Where /media/username/GRUB is your USB drive):

   $ sudo grub-install --boot-directory=/media/username/GRUB --efi-directory=/media/username/GRUB --removable --target=x86_64-efi 

   b. Windows (Where G: is your USB drive):

   > grub-install.exe --boot-directory=G:\ --efi-directory=G: --removable --target=x86_64-efi 

2. Download RU.efi from https://ruexe.blogspot.com 2 the latest is 5.28.0397.zip (Password: 3709180014499)
3. Download RuSmi driver from RuSmi.zip 1 (Password: 10072767)
4. Copy RuSmiPi.efi and RU.efi to the root of your USB drive
5. Reboot the X300 and press F11 to get the boot menu and select the UEFI USB device
6. When it boots into GRUB you should see a grub prompt:

grub> ls -l
grub> ls -l (hd0)/
grub> chainloader (hd0)/RuSmiPi.efi
grub> chainloader (hd0)/RU.efi
grub> boot

7. You may have to try loading RU.efi one extra time. You should now be in RU.
   Here are some useful shortcuts:

Alt-= to show a list of EFI modules
Press <enter> to edit EFI variable offsets
Ctrl-PgUp to go up a page of variables
Ctrl-PgDn to go down a page of variables
F12 for screenshot
Ctrl-W to write changes
Alt-Q Quit

8. You can select "AmdSetup" from the list and press to edit the variables. The reason we know it's CbsSetupDxeRN is because the size is 0x5A8 (whilst CbsSetupDxeRV is 0x5A7)

Unfortunately after these changes I see no changes in the IOMMU grouping. I don’t know if this is a limitation of the X300, my 4750G or the fact we don’t have access to the “ACS Enable” option. I’m getting a 5700G tomorrow and will be installing it to see if the extra PCIe lanes changes anything.

IOMMU Group 0:
    00:01.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge [1022:1632]
    00:01.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge [1022:1633]
    01:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 [144d:a808]
IOMMU Group 1:
    00:02.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge [1022:1632]
    00:02.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge [1022:1634]
    00:02.3 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge [1022:1634]
    00:02.4 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge [1022:1634]
    02:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 [144d:a808]
    03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
    04:00.0 Network controller [0280]: Intel Corporation Wi-Fi 6 AX200 [8086:2723] (rev 1a)
IOMMU Group 2:
    00:08.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge [1022:1632]
    00:08.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus [1022:1635]
    00:08.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus [1022:1635]
    05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev d8)
    05:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:1637]
    05:00.2 Encryption controller [1080]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor [1022:15df]
    05:00.3 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1 [1022:1639]
    05:00.4 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1 [1022:1639]
    05:00.6 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller [1022:15e3]
    06:00.0 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] [1022:7901] (rev 81)
IOMMU Group 3:
    00:14.0 SMBus [0c05]: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller [1022:790b] (rev 51)
    00:14.3 ISA bridge [0601]: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge [1022:790e] (rev 51)
IOMMU Group 4:
    00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 0 [1022:1448]
    00:18.1 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 1 [1022:1449]
    00:18.2 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 2 [1022:144a]
    00:18.3 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 3 [1022:144b]
    00:18.4 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 4 [1022:144c]
    00:18.5 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 5 [1022:144d]
    00:18.6 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 6 [1022:144e]
    00:18.7 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 7 [1022:144f]

X3MSTX_1.70_CbsSetupDxeRN IFR.txt (229 KB)

X3MSTX_1.70_CbsSetupDxeRV IFR.txt (224 KB)

X3MSTX_1.70_Setup IFR.txt (442 KB)

Here’s a compiled version of flashrom with Ryzen support (https://github.com/tolga9009/flashrom/tree/ryzen 125). It includes the libpci library so it supports the -p internal flag. It’s possible to compile libpci on Windows using MinGW 11 and DJGPP 5 so I’ve also attached the "libpci-libgetopt" folder with the pre-compiled libraries included so you can compile your own version easily.

Use this to compile it from MSYS:

make CC=i586-pc-msdosdjgpp-gcc STRIP=i586-pc-msdosdjgpp-strip LIBS_BASE=../libpci-libgetopt CONFIG_ENABLE_LIBUSB1_PROGRAMMERS=no 

I've also included a version of Rufus that will create an MS-DOS boot disk. NOTE: You may need to enable the Compatibility Support Module (CSM) in your BIOS to boot it.

To backup your BIOS:

flashrom -p internal -r BACKUP.ROM 

To write your own custom BIOS:

flashrom -p internal -w MOD.ROM 

flashrom.zip (279 KB)

libpci-libgetopt.zip (185 KB)

Rufus_3.8.1579_Win10_MSDOS-Mod.zip (1.91 MB)

Disclaimer: Do this at your OWN RISK! I will not be held responsible for anyone bricking their machine!

I made the mods based on @Lost_N_BIOS's post here and by following the How-2-Rip-It-Open-Yourself guide here.

This patch has been confirmed to work with both 15X v8 and 15W v8 models. Make sure you have your Aero's BIOS flashed to version FB0A using the official release on the Gigabyte website here before attempting the following.

First you must run command prompt (as Administrator) and run "FPTw.exe -bios -d biosreg.bin". You can get FPTw.exe from Intel CSME System Tools v12 r18 (located in the "Flash Programming Tool" folder).

Next you will need to run UEFITool 0.26.0 and open biosreg.bin. Select File->Search... Text tab and enter AMITSE. A list of search results will show at the bottom. Double click on "Unicode text "AMITSE" found in User interface section at offset 0h". Right click on the "PE32 image section" and select "Replace as is...". Browse to the (unzipped) file attached (Section_PE32_image_AMITSE_AMITSE.zip). File->Save image file... and call it biosmod.bin.

Then you need to run AMIBCP 5.02.0031 and open biosmod.bin to set the menu access to USER like so:

Once you File->Save run "FPTw.exe -bios -f biosmod.bin".

If you get the following error:

Quote:Error 167: Protected Range Registers are currently set by BIOS, preventing flash access.

This is caused by the BIOS Lock variable set to 0x01 (Enabled):
Code:
BIOS Lock, VarStoreInfo (VarOffset/VarName): 0xA12

How to set the BIOS Lock variable to 0x00 (Disabled):

1. Make sure you have following values set in BIOS:
     - Legacy Support: Disable
     - Secure Boot: Disable
2. Take USB stick and format to FAT32
3. Create directory structure EFI\Boot
4. Download and unzip bootx64.7z
5. Put BOOTX64.EFI into Boot directory
6. Boot from this USB stick
7. Run command: setup_var 0xA12 0x00
8. Run command: reboot

Attempt to write the modified BIOS again using FPTw.exe.

If successful this time run "FPTw.exe -greset" to reboot.

Press F2 to enter BIOS you should (hopefully) be greeted with some extra menus...

Big thanks to @Lost_N_BIOS!