09-13-2016, 09:42 AM
I have keep silence on this GbE topic for a while, and appreciate on parties opinion that have interest into this issue.
1. For recently feedback, We aware that this GbE issue is not affected all board and only to apply to certain percentage of boards.
2. The power supply quality can affected the board GbE perofromance.
3. All the GbE affected boards still can runs well on the 10/100 Mbps Ethernet setup.
4. We recently also discovered there is another vendor board also suffer on this same situation. We have already work with this board vendor on the GbE issue collaboration and has narrow down the cause.
5. Our originally focus is on GbE delay factor and seems like this is not the case.
6. There is RTL8211 patch floating in internet and we have not try out.
Our currently lead on this investigation is toward the power quality that RTL8211 received, namely small voltage ripping wave on the VDD and AVDD line. It seems that certain RTL8211 chip sensitive to this voltage noise. We have testing this theory on the other vendor board and initial results seems works well.
We are collecting more GbE affected Pine A64+ boards and our hardware engineering team are focusing into this path. The focus point is on one inductor (ferrite bead) at one of the VDD power line to RTL8211 chip.
P/S: Appreciate Marcus and Tom kaiser effort on this finding.
Regards,
TL Lim
1. For recently feedback, We aware that this GbE issue is not affected all board and only to apply to certain percentage of boards.
2. The power supply quality can affected the board GbE perofromance.
3. All the GbE affected boards still can runs well on the 10/100 Mbps Ethernet setup.
4. We recently also discovered there is another vendor board also suffer on this same situation. We have already work with this board vendor on the GbE issue collaboration and has narrow down the cause.
5. Our originally focus is on GbE delay factor and seems like this is not the case.
6. There is RTL8211 patch floating in internet and we have not try out.
Our currently lead on this investigation is toward the power quality that RTL8211 received, namely small voltage ripping wave on the VDD and AVDD line. It seems that certain RTL8211 chip sensitive to this voltage noise. We have testing this theory on the other vendor board and initial results seems works well.
We are collecting more GbE affected Pine A64+ boards and our hardware engineering team are focusing into this path. The focus point is on one inductor (ferrite bead) at one of the VDD power line to RTL8211 chip.
P/S: Appreciate Marcus and Tom kaiser effort on this finding.
Regards,
TL Lim