This patch fixes the failure where loady a y-modem serial loader fails to load a binary over the serial port.
#loady <load-addr> <baudrate>
With loady after the serial port on board is put in receive mode, the tera-term sends a file using y-modem mode, but the tstc/getc never comes to know that a character has been received in RX buffer, and so cannot identify the header which results in serial transfer failure.
RX watermark bit is set when ever a character is received on serial port. Using RX watermark bit in the IP register solves this problem.
Patch is based on commit 884512f7dbf9 ("Merge tag 'uniphier-v2019.07' of https://gitlab.denx.de/u-boot/custodians/u-boot-uniphier").
Booted linux kernel uImage loaded over y-modem on the HiFive Unleashed A00 board.
Sagar Shrikant Kadam (1): riscv : serial: use rx watermark to indicate rx data is present
drivers/serial/serial_sifive.c | 23 +++++++---------------- 1 file changed, 7 insertions(+), 16 deletions(-)