Hello,
recently I changed to a new laptop (DELL M90) without RS232. I'm using monitor in ROM and the simulated serial interface for debugging. Everything is working fine if I'm using the integrated RS232 port of the docking station or one of the docking stations RS232-PCI card. But to be mobile I tried a Prolific USB-Serial converter and it fails. It was not very surprising me since we had different problems before (communication stops after some hours). Then I tried a 2x serial ExpressCard (NEWCARD-22020, with a 16C952 UART chip) but it also fails. After that I tried a small program with the bootstrap loader and it fails too. Sometimes the download starts, but the connection aborts after short time. May be a timing problem? I fiddled around with different FIFO parameters but was not successful.
Of course: I have checked all components with a terminal program.
Any ideas?