Request for the schematic diagram of the P350Tiny.

[qq8322302]

Do you have any drawings related to the Tiny7 series (P350Tiny)?

[a-little-wifi]

I wishhhhh, sadly I do not, I'd really like to have those myself too. Newest one I have is for the P340, I can give you that, it's decently similar in a lot of ways. I assume you're asking because you're interested in soldering on the 3rd NVMe slot though, that's something I've been looking into already and I have some resources related to it. Is that what you're looking for?

[a-little-wifi]

Actually, looking at your profile it seems like you're working on a Tiny6 bifurcation riser! That's cool, I'm also working on a Tiny6 riser lol (though not using bifurcation). While the P340 and P350 use the same riser slot their implementation is quite different, the P340 runs lane 8-15 from the CPU to it so it can be bifurcated into x4x4 without lane reversal, while the P350 runs lane 0-7 to the riser slot and the other 8 lanes are used for the on board SSD slots to support PCIe 4.0, meaning the riser slot cannot be bifurcated without sacrificing the SSD slots and also using lane reversal, making it incompatible with a solution that also works on the P340.

[qq8322302]

Yes, I have the information for P340, and my P340Tiny adapter card has been designed, mass-produced, and put on sale.
https://item.taobao.com/item.htm?id=901219002736
Here is a photo of my P340 expansion card

I am going to study Tiny7 (P350) next, so I am consulting with you to see if there is any information on P350.
Because I haven't purchased the P350 yet, I plan to collect some information first.

[qq8322302]

As you mentioned, the 0-7 of CPUx16 points to the PCIE socket, and the 8-15 points to the 2*M.2 socket on the back of the motherboard. Therefore, it is indeed impossible or unnecessary to separate them.
So Tiny7, I want to implement the following functions, I don't know if it's feasible:

1. Add M2_SSD3 slot
2. Add M2-WWAN slot
3. Add JSTAT2 slot

[a-little-wifi]

Nice work on that riser! The traces for the CPU M.2 slot going under unused pins is funny lol.
For the P350, I've also been looking into the same things. I have 2 P350s over here generously on loan from @evil2k2, one of them is a Rev 0.4 board that has the 3rd NVMe slot soldered on and working, I'm using it for reference to work out how to apply the mod to an unmodified P350. It at least shows that it's definitely feasible.
There's high resolution photos of both the unmodified and modified motherboards here https://github.com/a-little-wifi/TinySecrets/tree/main/boardpics/Lenovo/P350 and here https://github.com/a-little-wifi/TinySecrets/tree/main/boardpics/Lenovo/Mods/P350%20triple%20NVMe

I've also dumped the bios flash chip on the modified P350 board, which has the 3rd NVMe slot detected in the bios screen, I can send you that if you want.

I haven't done much experimenting with the WWAN slot yet, but visually it does look like there's a PCIe x1 lane running to it, so could be useful

For the second sata connector, I did some research and I believe this is the correct connector part that should be installed there: https://www.digikey.com/en/products/detail/cvilux-usa/CF20121V0R0-NH/15793091

[a-little-wifi]

By the way, slightly unrelated question, but do you mind if I add the pictures of the risers you made to the riserpics directory in this repo? I'd like to collect the most complete list of risers I can.

[qq8322302]

Okay, please send the BIOS to my email (If there are any other materials about P350, they can be sent together), qq8322302@gmail.com

Welcome to submit the riser card photo to your directory.

[qq8322302]

@a-little-wifi My P350 expansion card is ready. It can expand up to 6 * NVME + 1 * SATA hard drives + 1* PCIE x8.
https://github.com/qq8322302/P350Tiny-riser-card
https://h5.m.taobao.com/awp/core/detail.htm?id=970676572487