Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revisionBoth sides next revision
en:arm:tqma7x:linux:ptxdist:known_issues [2018/05/22 11:17] – changed template + added labels build_system and build_system_head liedmannen:arm:tqma7x:linux:ptxdist:known_issues [2018/06/13 13:37] – added RS485 issue liedmann
Line 36: Line 36:
 ---- ----
  
-===== MBa7x ======+===== MBa57x ======
 ==== RS485 ==== ==== RS485 ====
 ^ RS485 bus block in half-duplex mode  ^^ ^ RS485 bus block in half-duplex mode  ^^
-^ Affects   | RS485 via UARTx   +^ Affects   | RS485 via UARTx on MBa57xx Revsion 01xx  
-^ Issue     | During i.MX7 reset the UARTx.CTS# pin is low by default (CPU internal pull down)  | +^ Issue     | During AM57xx reset the UARTx.CTS# pin is low by default (CPU internal pull down)  | 
-^ Effect    | Using the MBa7x RS485 circuitry in a half-duplex slave device or half-duplex multi-master environment may block the RS485 bus during i.MX7 reset.\\ The bus is released as soon as the UARTx.CTS# pin is properly configured by software (e.g. U-Boot, Linux, etc.)  | +^ Effect    | Using the AM57xx RS485 circuitry in a half-duplex slave device or half-duplex multi-master environment may block the RS485 bus during AM57xx reset.\\ The bus is released as soon as the UARTx.CTS# pin is properly configured by software (e.g. U-Boot, Linux, etc.)  | 
-^ Solution / Workaround  | Add a 10k pull up to the UARTx.CTS# signal on carrier board  |+^ Solution / Workaround  | Add a 10k pull up to the UARTx.CTS# signal on carrier board \\  This behaviour will be fixed with MBa57xx REV.02xx   |
  
  • Last modified: 2022/08/04 15:02