From: "Iain Sandoe" <iain@sandoe.co.uk>
To: Takashi Oe <toe@unlserve.unl.edu>
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: Stealth port problems
Date: Sun, 30 Jul 2000 14:01:19 +0100 [thread overview]
Message-ID: <200007301300.OAA07050@hyperion.valhalla.net> (raw)
On Sun, Jul 30, 2000, Takashi Oe wrote:
> On Sun, 30 Jul 2000, Iain Sandoe wrote:
>
> [...]
>> The RX buffer in an 85230 (which is actually the chip - IIRC - an enhanced
>> 8530) is 8 characters deep
>
> Ok, this is a news to me. I'm certain that SCC on oldworld pmacs is
> 85C30. When did the change to 85230 occur? If I remember correctly,
> some DMA setup codes in macserial.c need to know about it if it's dealing
> with 85230 rather than 85C30.
OK - I don't know for certain - but the code refers to an "ESCC" which is
the name of the 85230 - the 8530 should just be called "SCC".
>> - so any more that about 700 us IRQ block will
>> cause a drop out at 115200 continuous...
>
> With DMA, this is a non-issue as far as serial driver is concerned.
This is, of course, true - unless something blocks for long enough to
prevent the IRQ that indicates end-of-dma transfer (assuming there is one).
Iain,
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next reply other threads:[~2000-07-30 13:01 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-07-30 13:01 Iain Sandoe [this message]
2000-07-30 14:01 ` Stealth port problems Takashi Oe
-- strict thread matches above, loose matches on Subject: below --
2000-08-02 17:13 Iain Sandoe
2000-08-01 11:11 Iain Sandoe
2000-07-31 12:22 Iain Sandoe
2000-08-01 10:28 ` Timothy A. Seufert
2000-08-02 16:22 ` Benjamin Herrenschmidt
2000-07-31 11:43 Iain Sandoe
2000-07-31 9:11 Iain Sandoe
2000-07-31 9:59 ` Timothy A. Seufert
2000-07-30 16:44 Iain Sandoe
2000-07-30 10:31 Iain Sandoe
2000-07-30 12:39 ` Takashi Oe
2000-07-31 7:12 ` Giuliano Pochini
2000-07-31 12:03 ` Geert Uytterhoeven
2000-07-28 5:33 Giuliano Pochini
2000-07-28 8:34 ` Benjamin Herrenschmidt
2000-07-28 14:23 ` Giuliano Pochini
2000-07-30 0:16 ` Giuliano Pochini
2000-07-30 13:01 ` Michel Dänzer
2000-07-30 12:59 ` Giuliano Pochini
2000-07-30 12:29 ` Takashi Oe
2000-07-31 7:01 ` Giuliano Pochini
2000-07-31 13:01 ` Giuliano Pochini
2000-08-01 0:09 ` Giuliano Pochini
2000-07-31 18:27 ` Benjamin Herrenschmidt
2000-07-30 14:11 ` Giuliano Pochini
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