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--- en:arm:tqma28:linux:ptxdist:known_issues [2018/05/18 16:12] – changed template + added labels build_system and build_system_head liedmann
+++ en:arm:tqma28:linux:ptxdist:known_issues [2020/08/05 12:39] – changed tab template liedmann
@@ Line 1: / Line 1: @@
 ~~NOCACHE~~
-<embed en:templates:tabs_new>
+<embed en:templates:tabs_ptxdist_bootstrap>
+  <label product_type>Embedded module</label>
   <label lang>en</label>
   <label mod_name>tqma28</label>
@@ Line 13: / Line 14: @@
 ===== Known Issues =====
+===== MBa28 ======
+==== RS485 ====
+^ RS485 bus block in half-duplex mode  ^^
+^ Affects   | RS485 via UARTx   |
+^ Issue     | During i.MX28 reset the UARTx.CTS# pin is low by default (CPU internal pull down)  |
+^ Effect    | Using the MBa28 RS485 circuitry in a half-duplex slave device or half-duplex multi-master environment may block the RS485 bus during i.MX28 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  |
+----
 == TQMa28 & TQMa28-fsl | e-MMC drive strength (SETDSR) ==
@@ Line 64: / Line 80: @@
   * **Issue**: The Operating System does not recognize USB devices if they are plugged in before boot.
   * **Workaround**: Modify the Devicetree. Add/change at** usb@80090000** the following property **"dr_mode" to "dr_mode = host"**