1.Reading SN/SMART for Multiple SSDs
Example for NVMe-MI appendix A for read VID and serial number.
Now, I have two P4510 SSD, and try to use SMBus to read some information by NVMe-MI 1.0a Appendix A specification.
Following table is data of VID and serial number by NVMe-MI 1.0a Appendix A example 2.
| only plug SSD1 | only plug SSD2 | Plug SSD1&SSD2 on same motherboard |
80 86 42 54 4c 4a 37 33 37 32 30 41 50 45 31 50 30 46 47 4e 20 20 | 80 86 42 54 4c 4a 37 33 37 33 30 30 46 4c 31 50 30 46 47 4e 20 20 | 80 86 42 54 4c 4a 37 33 37 32 30 00 40 44 31 50 30 46 47 4e 20 20 |
By SMBus, SSD1 should win bus arbitration at value 0x32 of Byte 0x9.
But in “Plug SSD1+SSD2 on same motherboard” case, the value of Byte 0xb/0xc/0xd are logical and result of SSD1 and SSD2 TX data (that meaning both devices still driving data line).
How can I get correct serial number for two P4510 SSDs?
2. No reaction for NVMe-MI Reset Arbitration
As NVMe-MI 1.0a Appendix A example 3, host sending command to SSD device, SMBus Arbitration bit of Status Flags of Subsystem Management Data Structure should be clear to 0.
And then host send SMBus block read of device's status , but host receive SMBus Arbitration bit is 1 after sending this command.
My platform:
HP F5G73AV Z840
smbus driver:
I2C Tools
訊息由此人編輯：家豪 楊