NVME SSD + CM4?
# │foruma
appinteractive
04/19/2023, 8:51 PMHey the documentation is a bit confusing, are the nvme ssd lots supported by CM4 modules? I thought not but out side of TP2 people are using such wit their CM4s so what’s the status and why? Thanks
d
DhanOS
04/19/2023, 8:51 PMHi
DhanOS
04/19/2023, 8:52 PMCM4s are not supporting the NVMe slot and here's why:
DhanOS
04/19/2023, 8:52 PMCm4 has only a single PCie 2.0 lane. Like a single lane on a single PCIe bus. This means only a single thing can be connected to it
DhanOS
04/19/2023, 8:53 PMTuring Pi 2 connects it to:
- Node 1 - Mini PCIe
- Node 2 - Mini PCie
- Node 3 - SATA
- node 4 - USB
DhanOS
04/19/2023, 8:53 PMSome other boards are using this lane to connect the NVMe drives indeed
DhanOS
04/19/2023, 8:54 PMThere are some modules that have secondary PCIe bus like Jetson modules or upcoming RK1 modules that'll utilize both
DhanOS
04/19/2023, 8:55 PMWith CMs, this is a design choice on TPi2. Choice that could potentially be changed with another CM4 carrier boards that route this PCie lane to the NVMe slot instead or maybe even contain a PCIe switch
a
appinteractive
04/19/2023, 8:55 PMOkay thanks for the clarification
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