Compatibiliy issue with nvme and p35 chipset

[ovlx]

Self explanatory,
The drive (kingston nv2 500gb ssd) is accessible by os,
the pcie device can be seen with the efishell pci command , and is labeled as a "Mass Storage Controller - Non-volatile memory subsystem". but does not appear as a blk device or file system
The nvme driver is loaded successfully, but no volume is detected according to the debug log
The device is never accessed by clover, I can confirm this because adapter I have has an access light,
the device is treated like a non-storage device.

this is occurring on a p35 lga775 board , tested with a netburst cpu (no ssse3) and a 45nm quad (with sse4.1) , and on 2 different p35 motherboards, and the result is the same,

using the same clover usb and nvme drive on a modern am4 motherboard, the drive is bootable in both bios(csm) and uefi mode.

I'm using the latest build of clover 5159, I did try an older build 5142 and had the same problem.

I can only speculate, but i'm assuming the issue is with the nvme driver? maybe it doesn't like pcie 1.0, I don't have a newer gen2 capable motherboard unfortunately, so i can't test that.
2024-06-30_18-54_CLOVERX64.EFI.log

If anybody could give me some pointers about where to look/what to do next I'd be happy to fix it myself