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en:arm:tqma57xx:linux:yocto:known_issues [2018/06/13 16:16] – created liedmann
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 +<embed en:templates:tabs_new>
 +  <label lang>en</label>
 +  <label mod_name>tqma57xx</label>
 +  <label mod_name_head>TQMa57xx</label>
 +  <label mod_arch>arm</label>
 +  <label bsp_name>linux</label>
 +  <label build_system>yocto</label>
 +  <label build_system_head>YOCTO</label>
 +  <label bsp_name_head>Linux</label>
 +</embed>
 +\\
 +\\
  
 +
 +===== MBa57x ======
 +==== RS485 ====
 +^ RS485 bus block in half-duplex mode  ^^
 +^ Affects   | RS485 via UARTx on MBa57xx Revsion 01xx  |
 +^ Issue     | During AM57xx reset the UARTx.CTS# pin is low by default (CPU internal pull down)  |
 +^ 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 \\  This behaviour will be fixed with MBa57xx REV.02xx   |
  • Last modified: 2022/08/04 15:02