I wonder if the port is using the irq or polling? I seem to recall
seeing really bad serial performance when the irq wasn't setup right once.
Here is some output from linux booting log:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing isabled
serial8250.0: ttyS0 at MMIO 0xe000c000 (irq = 6) is a 16550A
serial8250.0: ttyS1 at MMIO 0xe0010000 (irq = 7) is a 16550A
serial8250.0: ttyS2 at MMIO 0xe0078000 (irq = 28) is a 16550A
serial8250.0: ttyS3 at MMIO 0xe007c000 (irq = 29) is a 16550A
Am i right saying that irqs were installed and are being used properly
according to the log above? The crystal which I am using is lpc2468 with
the following definitions from 8250.c:
[PORT_16650] = {
.name = "ST16650",
.fifo_size = 1,
.tx_loadsz = 1,
.flags = UART_CAP_FIFO | UART_CAP_EFR |
UART_CAP_SLEEP,
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