On Fri, Mar 28, 2008 at 04:58:37PM +0530, Tiju wrote: > Hi all > > I am trying to port u-boot to a s3c2440 samsung processor. > > I applied the smdk2440 boards patch (almost similar architecture) and > trying to modify it for our board's requirement. But during the > serial_init it goes to the _serial_putc and then after certain loops > it goes to the hang function and hangs there.
this sounds like a flow control issue. The s3c24xx boards support hardware flow control handling, i.e. their TX FIFO will not transmit any more characters unless the RTS/CTS handshake allows it to. Since the u-boot serial code does an endless loop waiting for the next character, it will busy-wait there. Please note that this is true even for UARTs that don't even have RTS/CTS. Don't use hw flow control on them. Another possible cause could be lack of proper GPIO configuration for the RTS/CTS pins, missing connection on the board, broken serial cable. Basically anthing that affects RTS/CTS from within the s3c24xx and the PC on the other side. -- - Harald Welte <[EMAIL PROTECTED]> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
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