Only, the flags don't work, nothing seems to happen? $ kenv | grep ppc hint.ppc.0.at="isa" hint.ppc.0.flags="0xc" hint.ppc.0.irq="7" $ dmesg | grep ppc ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0 ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode ppc0: FIFO with 16/16/16 bytes threshold ppbus0: <Parallel port bus> on ppc0 --On torsdag, juli 15, 2004 19.00.18 +0100 Antony T Curtis <antony.t.curtis_at_ntlworld.com> wrote: > On Thu, 2004-07-15 at 16:42, Palle Girgensohn wrote: >> Hi! >> >> >> For a while now my parallel port (with printer hooked up) has been >> *really SLOW*. Takes several minutes to print a single very simple page. >> >> Any idea how to debug or what to try/fix? >> >> All I see in the log is: > > <snip> > >> ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0 >> ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode >> ppc0: FIFO with 16/16/16 bytes threshold > > if you do a "man ppc" there are flags settable on the ppc device. > If you set the flags so that it is in ECP mode, it will be much faster. > Even EPP mode works faster. > > IIRC Compatible mode uses an interrupt for every character. EPP can > handle a burst of characters while ECP uses DMA so can transfer a large > block per interrupt. > > -- > Antony T Curtis <antony.t.curtis_at_ntlworld.com> >Received on Thu Jul 15 2004 - 19:07:12 UTC
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