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Add patch that restores user intent in serial setup handling. Upstream commit 77320571e63c ignores user input when RS485 was pre-configured, breaking loopback and flow-control tests. This patch ensures RS485 can be explicitly controlled while still respecting pre-existing configurations when appropriate. Signed-off-by: Vitor Soares <vitor.soares@toradex.com> Signed-off-by: Khem Raj <raj.khem@gmail.com>