Hello,

i'm stuck at the DXE integration, i've tried to find DXE but it not show's up in UEFITool0.22.4 am i getting something wrong? Link

My board is a Asrock X79 Extreme4.

@Fernando thank you, didn't see it because the window is to small :D

...and thank you for the hint ;)
Hope you're doing well and thank you for this great board!

Regards

Hello all!

First of all - congratulations for Fernando for having the best bios modding forum on the net! I've used your guides many times in the past without any issues. Same with NVMe mod, however curiosity makes me to write my first post. I've done my mod some time ago (in 2017 I guess) with v3 of the NvmExpressDxE. Recently bought NVMe drive which works and boots as described on Z87 board. Few days ago I've check the thread again and noticed that file has been updated to v4. So my question is: are there any advantages on V4 compared to V3? My mind is a bit twisted and everything need to be updated, so I'm torn - leave it or update?

Thanks!
D.

Fernando, would you happen to know the NVMe version for that one you uploaded in this forum post? 1.3 or newer i suppose?.. maybe 1.3c or something? Just curious

Zitat von Fernando im Beitrag #3184

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Zitat von lime im Beitrag #3183

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Fernando, would you happen to know the NVMe version for that one you uploaded in this forum post?

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I do not really understand. Which "NVMe version" (driver or BIOS module) and which Forum post do you mean?

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@Fernando:
Thanks Fernando for being professional. I've been a PITA asking Q's. I just want to know literally everything so incase later on i might need the info atleast i've asked it and its on Win-Raid forums and maybe in future this forum might not be as active so getting into contact with you or others will be extremely hard. Just looking out for future :) Thanks. Will look forward to Ethaniel's reply back.

@lime & @Fernando:
As far as I understand the code and the specifications, the EDK2 NVMe driver does not depend on any optional features or features introduced in later versions of the specification and all released versions of the specification seem to be backward compatible.

As a conclusion the driver should be compatible with all versions of the "NVM Express" specification listed on https://nvmexpress.org/resources/specifications/ (currently 1.0e - 1.3c)

Additional specifications, like NVMe Over Fabrics and NVM Express Management Interface are most likely not supported because are out of the scope of the driver.

The driver has two limitations:
- Only supports 4k page size (the specification allows for other page sizes but probably all NVMe controllers conform to this because the x86 architecture (including 64-bit extensions) is using this page size by default so 4k pages are most likely required for MMIO to work on this architecture)
- Only the NVM command set is supported (the specification allows for other command sets and the NVM command set is not required to be supported but no current specification defines any other command set)

Note that my changes should not affect specification compatibility so the above should be true for all existing versions of EDK2-based NVMe drivers.

Hi all,

I own an Asus P8Z77-V-Deluxe motherboard: https://www.asus.com/Motherboards/P8Z77V...specifications/

I would like to know if:
1. A PCIe adaptor could work on my motherboard?
2. If I could boot from it?
3. How can I tell if I have enough PCI lanes to get the full benefit of NVMe SSD?

This motherboard has the following PCI-E slots:
2 x PCIe 3.0/2.0 x16 (x16 or dual x8)
1 x PCIe 2.0 x16 (x4 mode, black)
4 x PCIe 2.0 x1 *4

The PCIe 3.0 is populated by 2 R9 290 GPU's (CrossFire)
So my only option is the PCIe 2.0 x16 (x4 mode, black) <0-- Assuming questions 1 and 2 are no issue, would this PCIe slot cripple NVMe speeds?


Thanks!

@gil:
1. Assuming you mean a PCIe to M.2 adapter, it should work. Make sure that the adapter has support for x4 lanes (and PCIe 2.0), but most likely the cheapest one you can find (with these specifications) should do it
2. Will not boot when using original BIOS. Should work with modded BIOS (see instructions in the start post of this thread)
3. According to the motherboard manual "1 x PCIe 2.0 x16 (x4 mode, black)" is not sharing bandwidth with anything, so you should be able to use all four lanes in that socket

Since you want to keep using all your PCIe 3.0 lanes for GPU's, you will be restricted to PCIe 2.0 speed. You want to make sure that both the adapter and the NVMe SSD has support for x4 lanes because your bandwidth will suffer otherwise.

PCIe 2.0 4x has ~2000 MB/s effective bandwidth that is more than the maximum effective bandwidth of SATA III that is ~600 MB/s, so it should be an improvement over SATA III SSD's. High-end NVMe SSD's have support for more than 2000 MB/s, so you may want to buy a less expensive NVMe SSD. Note that PCIe is full duplex so your motherboard should support 2000 MB/s read and 2000 MB/s write simultaneously for the PCIe 2.0 4x slot.

@Ethaniel:
Okay, thank you Ethaniel. Very helpful. Really looking forward to purchasing a Intel 900P 480GB :D