SuperMicro PCI-e bifurcation problem

[leonyff]

Hi, everyone :

I have Supermicro X11SPL-F I’ve enabled bifurcation 4x4x4x4 ! Unable to boot system, always restart. I can't even get into the BIOS! Are there any other Settings ?

 

[HoneyBadger]

Hi, everyone :

I have Supermicro X11SPL-F I’ve enabled bifurcation 4x4x4x4 ! Unable to boot system, always restart. I can't even get into the BIOS! Are there any other Settings ?

According to SuperMicro, there are no electrical x16 slots in this system - the two physical x16 slots have only x8 lanes wired, so x4x4x4x4 birfucation should not even have been exposed as an option. x4x4 should be the correct one.

X11SPL-F | Motherboards | Products | Supermicro

Try removing the PCIe card in the slot that you have set up for bifurcation, and see if that will allow you to re-enter the BIOS and disable bifurcation. If this does not work, use the CMOS clear button JBT1 on your motherboard, as described in section 2-8 of the PDF manual linked below:

https://www.supermicro.com/manuals/motherboard/C620/MNL-1950.pdf

What is the card you are attempting to use with the x4x4x4x4 bifurcation?

 

[leonyff]

根据SuperMicro的说法，该系统中没有电气x16插槽 - 两个物理x16插槽只有x8通道布线，因此x4x4x4x4 birfucation甚至不应该作为一个选项暴露。x4x4 应该是正确的。

https://www.supermicro.com/en/products/motherboard/x11spl-f

尝试卸下已设置为分叉的插槽中的 PCIe 卡，看看这是否允许您重新进入 BIOS 并禁用分叉。如果这不起作用，请使用主板上的 CMOS 清除按钮 JBT1，如下面链接的 PDF 手册的第 2-8 节所述：

https://www.supermicro.com/manuals/motherboard/C620/MNL-1950.pdf

您尝试与 x4x4x4x4 分叉一起使用的卡是什么？

Thank you for your help! Sorry, my English is not good, I am using software translation yes, i can Enter the bios after clear CMOS

I read the motherboard manual Here's how I set it up

I want to insert two pcie to U.2 cards in SLOT2 (pcie x8) and SLOT3 (pcie x8), I read the motherboard manual Do SLOT2 and SLOT3 correspond to IOU2 (IIO PCIe Br3)? i enable bifurcation 4x4x4x4 for IOU2 (IIO PCIe Br3)
By the way, I only have 2 U.2 SSDS right now and I didn't plug in all 4 of them

 

[Johnny Fartpants]

May not be related but I had a similar issue where system kept restarting and wouldn't let me in the BIOs. To fix I had to remove the HBAs then I could boot into BIOs and disable OpROM.

 

[HoneyBadger]

Thank you for your help! Sorry, my English is not good, I am using software translation yes, i can Enter the bios after clear CMOS

I read the motherboard manual Here's how I set it up

View attachment 60849

I want to insert two pcie to U.2 cards in SLOT2 (pcie x8) and SLOT3 (pcie x8), I read the motherboard manual Do SLOT2 and SLOT3 correspond to IOU2 (IIO PCIe Br3)? i enable bifurcation 4x4x4x4 for IOU2 (IIO PCIe Br3)
By the way, I only have 2 U.2 SSDS right now and I didn't plug in all 4 of them

View attachment 60851


View attachment 60850

Hello!

I am happy that you are able to enter the BIOS again.

What is the exact model of the PCIe to U.2 cards you are using? I have researched your motherboard model and it appears that other users have had difficulty in getting the bifurcation function to work with cards like the AOC-SLG3-2E4 - this card looks similar to the ones in your picture. Some X11 boards are listed as compatible, but not all boards. There may also be slot restrictions. I am not sure which IOU connects to the slots on your motherboard.

AOC-SLG3-2E4 | Add-on Cards | Accessories | Products - Super Micro Computer, Inc.

Is there a BIOS update available for your board?