search

MEN-Mikro-Elektronik / 13MD05-90

MDIS5 System Package for Linux (including drivers)
Other
4 stars 4 forks source link

DC19 serial console outputs garbage #213

Closed mlassota closed 3 years ago

mlassota commented 4 years ago

I've tried to deal with issue #212 using serial console but it outputs garbage. The console redirection is default (I used "Load Defaults" in BIOS). Client configuration (minicom) matched those default settings. I've tried different settings (speed, parity etc.) but it didn't work.

dpfeuffer commented 4 years ago

1) Am I right, that the problem concerns the BIOS redirection prior to Linux boot (no Linux involved)? 2) Does the same UART interface work under Linux? 3) Which BIOS version does your DC19 have?

mlassota commented 4 years ago
  1. Am I right, that the problem concerns the BIOS redirection prior to Linux boot (no Linux involved)?

Yes, that is right. This is not MDIS related problem.

  1. Does the same UART interface work under Linux?

Yes. I did tests using loopback to verify this (but with Console Redirection disabled).

  1. Which BIOS version does your DC19 have?

1ATJS 1.08 x64

dpfeuffer commented 4 years ago

Please make an additional test under Linux with a connection to another system (not just a loopback test). According to F.R. we have had the same behavior (garbage output) caused by a HW defect. It could be possible that the DC19-->LOOPBACK-->DC19 seems ok, when the HW malfunction influences TX and RX in the same way.

mlassota commented 4 years ago

I did test DC19-->RS232->MY_DESKTOP_PC (both running Linux) and the output is a mess (in both directions). So you're right, it's HW defect.

dpfeuffer commented 4 years ago

Send us the DC19 for repair after 13MD05-90_02_03 tests are finished.

mlassota commented 3 years ago

Turns out, that User Manual, chapter 2.7.6 Switching between RS232 and RS422/RS485 Interface, explains everything.