im using rtlinux-2.2. ive installed IRQ handler for
IRQ4(/dev/ttyS0) using rtl_request_irq(). the handler
is as follows.
{
rtl_printf("<IRQ 4 handler> IIR = %x",
inb(COMM1BASE+2));
return 0;
}
ive also connected the 2 serial ports using a null
modem cable.
when i do "echo hello > /dev/ttyS1" i thought data
will b recved in /dev/ttyS0(due to the null modem
cable) and ill get an interrupt. but it doesnt happen.
but when i do "echo hello > /dev/ttyS0" i get 2
interrupts as follows.
<IRQ 4 handler> IIR = c2
(after some time)
<IRQ 4 handler> IIR = 1
the first i found was tx buffer empty and the 2nd was
no ints pending.
ive checked the null modem cable and its perfect.
wat should i do to get the interrupt on the recving side?
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