This series fixes an issue on the QCS615 EVK where U-Boot incorrectly stops at the CLI prompt instead of continuing the boot process when the UART cable is disconnected.
Electrical noise on floating RX lines can be interpreted as valid UART data. Without proper runtime validation of received data, U-Boot treats this noise as legitimate keypresses, causing it to halt at the prompt rather than continue the boot sequence. This series updates the initialization sequence to properly drain FIFO contents and adds runtime checks to distinguish valid UART data from noise. --- Changes in v2: - Add initialization sequence for RX init based on Kernel driver. - Link to v1: https://lore.kernel.org/u-boot/[email protected]/ To: Sumit Garg <[email protected]> To: [email protected] To: [email protected] Cc: Casey Connolly <[email protected]> Cc: Neil Armstrong <[email protected]> Cc: Tom Rini <[email protected]> Cc: Andrew Goodbody <[email protected]> Cc: Stephen Boyd <[email protected]> Signed-off-by: Balaji Selvanathan <[email protected]> --- Balaji Selvanathan (2): serial: msm_geni: fix RX FIFO init with proper cancel sequence serial: msm_geni: validate RX FIFO data with IRQ status flags drivers/serial/serial_msm_geni.c | 91 ++++++++++++++++++++++++++++++++++++---- 1 file changed, 82 insertions(+), 9 deletions(-) --- base-commit: ece349ade2973e220f524ce59e59711cc919263f change-id: 20260707-uart-af9daffadb54 Best regards, -- Balaji Selvanathan <[email protected]>
