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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. foone‏ @Foone 29 May 2020
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      but it's functionally a separate machine so even when the main server is powered off, you can still connect over the network and turn it on.

      2 replies 0 retweets 53 likes
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    2. foone‏ @Foone 29 May 2020
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      it's interesting that they use a PCMCIA card for modem part. I imagine that's because it was optional, and many users didn't need modem access, and it was just a simple way to add in modem support.

      1 reply 1 retweet 45 likes
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    3. foone‏ @Foone 29 May 2020
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      ANYWAY if you need a 1997 management card for your PCI server, here's this card on ebay: https://www.ebay.com/itm/Psion-Wan-Global-PC-card-56K-fax-Gold-card/363006963095 …

      2 replies 0 retweets 56 likes
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    4. foone‏ @Foone 29 May 2020
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      I wonder what this port is? I guess based on the positioning, the dell servers it's designed for would have a special connector there, but what does it do? Maybe VGA/keyboard? those aren't easy to run over PCI...pic.twitter.com/u1eeCVgzV6

      5 replies 0 retweets 37 likes
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    5. Hector Martin‏ @marcan42 29 May 2020
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      Replying to @Foone

      Has to be power control, right? The card needs to be able to turn the server on and off after all. Maybe also more standby power. I don't know about that era, but these days the BMC (generic term) also *is* the video card, so that could run over PCI. But no VGA out so maybe not.

      1 reply 0 retweets 4 likes
    6. Hector Martin‏ @marcan42 29 May 2020
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      Replying to @marcan42 @Foone

      There's a 9-pin IDC connector too, which could be for a serial port bracket for the iDRAC itself, *or* to loop back to the server's own serial port. The latter would make a lot of sense.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 29 May 2020
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      Replying to @marcan42 @Foone

      I can't find the manual PDF, but there's a cache: https://webcache.googleusercontent.com/search?q=cache:_bzhyQVieFoJ:https://cs.uwaterloo.ca/~brecht/servers/docs/PowerEdge-2600/en/Drac/dra24bk1.pdf+&cd=1&hl=en&ct=clnk&gl=jp#19 … Looks like it takes standby power from an external power adaptor! And it's optional but if not present, it can only run for a while on battery.

      2 replies 0 retweets 1 like
    8. Hector Martin‏ @marcan42 29 May 2020
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      Replying to @marcan42 @Foone

      It seems they call the extra mobo connector the "ESM" connector, and it sounds like it's mostly an interface to another micro on the motherboard that fans out to whatever they need to control. So if I had to guess it's some serial/i2c/spi or someting interface to it?

      1 reply 0 retweets 1 like
    9. Hector Martin‏ @marcan42 29 May 2020
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      Replying to @marcan42 @Foone

      And it might also have the basic serial port interface on it for console redirection. I'm getting the feeling that DRAC in this age did not support VGA/keyboard/mouse redirection, only serial...

      2 replies 0 retweets 1 like
    10. Hector Martin‏ @marcan42 29 May 2020
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      Replying to @marcan42 @Foone

      Oh nope, the manual says it does VGA too. Maybe it is in that connector too. 15 pins is enough for basic VGA + serial x2 or so.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 29 May 2020
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      Replying to @marcan42 @Foone

      Ohh wait. They cheat and use drivers. So it doesn't *actually* do VGA redirection. They probably have some hack, like mirroring the VGA text hardware in the iDRAC card or BIOS tricks for text, and rely on drivers for anything else. Same for kb/mouse.pic.twitter.com/QI70UU3eDe

      12:37 AM - 29 May 2020
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        2. Hector Martin‏ @marcan42 29 May 2020
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          Replying to @JonathanWHendry @Foone

          It's neither, because they don't actually do VGA redirection as I explained. They just have some data channel and some driver that scrapes the screen and pumps frames over that to be sent via the modem or Ethernet.

          1 reply 0 retweets 1 like
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