* question about UART ST16C2552
@ 2003-09-18 1:37 Yuxiao Xi
2003-09-18 16:00 ` Kumar Gala
0 siblings, 1 reply; 6+ messages in thread
From: Yuxiao Xi @ 2003-09-18 1:37 UTC (permalink / raw)
To: linuxppc-embedded
Hi,all,
Does Linux support UART ST16C2552 ?
There is a UART ST16C2552 on my board with CPU ppc8240.
While the linux system booting,sometimes function autoconfig(struct
serial_state * state) in ./drivers/char/serial.c detected ST16C2552 as
16450,sometimes as 8250,can anyone tell me why?
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Yuxiao Xi
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡xiyuxiao@harbournetworks.com
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-18
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about UART ST16C2552
2003-09-18 1:37 Yuxiao Xi
@ 2003-09-18 16:00 ` Kumar Gala
0 siblings, 0 replies; 6+ messages in thread
From: Kumar Gala @ 2003-09-18 16:00 UTC (permalink / raw)
To: Yuxiao Xi; +Cc: linuxppc-embedded
For 824x the detection code for the on-chip UART does NOT currently
detect it as a 16550A. There is a patch that Tom Rini and I are
working on getting accepted by the serial maintainers, that should fix
this.
However, its not clear to me from your email if you also have a
ST16C2552 in addition to the DUART on the 8240.
- kumar
On Wednesday, September 17, 2003, at 08:37 PM, Yuxiao Xi wrote:
>
> Hi,all,
> Does Linux support UART ST16C2552 ?
> There is a UART ST16C2552 on my board with CPU ppc8240.
> While the linux system booting,sometimes function autoconfig(struct
> serial_state * state) in ./drivers/char/serial.c detected ST16C2552 as
> 16450,sometimes as 8250,can anyone tell me why?
>
> !!!!!!!!!!!!!!!!Yuxiao Xi
> !!!!!!!!!!!!!!!!xiyuxiao@harbournetworks.com
> !!!!!!!!!!!!!!!!!!!!2003-09-18
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: question about UART ST16C2552
@ 2003-09-18 16:23 Milliorn Gary-rxcr80
2003-09-18 16:29 ` Kumar Gala
0 siblings, 1 reply; 6+ messages in thread
From: Milliorn Gary-rxcr80 @ 2003-09-18 16:23 UTC (permalink / raw)
To: Gala Kumar K.-galak, Yuxiao Xi; +Cc: linuxppc-embedded
[-- Attachment #1: Type: text/plain, Size: 1262 bytes --]
Kumar,
There is no DUART on the MPC8240, if 8240 is what he literally
meant. Some boards, like Unity, used to have an external DUART
for this reason.
Gary Milliorn
> -----Original Message-----
> From: Kumar Gala [mailto:kumar.gala@motorola.com]
> Sent: Thursday, September 18, 2003 11:01 AM
> To: Yuxiao Xi
> Cc: linuxppc-embedded
> Subject: Re: question about UART ST16C2552
>
>
>
> For 824x the detection code for the on-chip UART does NOT currently
> detect it as a 16550A. There is a patch that Tom Rini and I are
> working on getting accepted by the serial maintainers, that should fix
> this.
>
> However, its not clear to me from your email if you also have a
> ST16C2552 in addition to the DUART on the 8240.
>
> - kumar
>
> On Wednesday, September 17, 2003, at 08:37 PM, Yuxiao Xi wrote:
>
> >
> > Hi,all,
> > Does Linux support UART ST16C2552 ?
> > There is a UART ST16C2552 on my board with CPU ppc8240.
> > While the linux system booting,sometimes function autoconfig(struct
> > serial_state * state) in ./drivers/char/serial.c detected
> ST16C2552 as
> > 16450,sometimes as 8250,can anyone tell me why?
> >
> > !!!!!!!!!!!!!!!!Yuxiao Xi
> > !!!!!!!!!!!!!!!!xiyuxiao@harbournetworks.com
> > !!!!!!!!!!!!!!!!!!!!2003-09-18
> >
>
>
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about UART ST16C2552
2003-09-18 16:23 Milliorn Gary-rxcr80
@ 2003-09-18 16:29 ` Kumar Gala
0 siblings, 0 replies; 6+ messages in thread
From: Kumar Gala @ 2003-09-18 16:29 UTC (permalink / raw)
To: Milliorn Gary-rxcr80; +Cc: Yuxiao Xi, linuxppc-embedded
Thanks for the correction. I guess my comments really apply to 8241,
8245 and 8540 then.
- kumar
On Thursday, September 18, 2003, at 11:23 AM, Milliorn Gary-rxcr80
wrote:
> Kumar,
>
> There is no DUART on the MPC8240, if 8240 is what he literally
> meant. Some boards, like Unity, used to have an external DUART
> for this reason.
>
> Gary Milliorn
>
>
>
> > -----Original Message-----
> > From: Kumar Gala [mailto:kumar.gala@motorola.com]
> > Sent: Thursday, September 18, 2003 11:01 AM
> > To: Yuxiao Xi
> > Cc: linuxppc-embedded
> > Subject: Re: question about UART ST16C2552
> >
> >
> >
> > For 824x the detection code for the on-chip UART does NOT currently
> > detect it as a 16550A. There is a patch that Tom Rini and I are
> > working on getting accepted by the serial maintainers, that should
> fix
> > this.
> >
> > However, its not clear to me from your email if you also have a
> > ST16C2552 in addition to the DUART on the 8240.
> >
> > - kumar
> >
> > On Wednesday, September 17, 2003, at 08:37 PM, Yuxiao Xi wrote:
> >
> > >
> > > Hi,all,
> > > Does Linux support UART ST16C2552 ?
> > > There is a UART ST16C2552 on my board with CPU ppc8240.
> > > While the linux system booting,sometimes function autoconfig(struct
> > > serial_state * state) in ./drivers/char/serial.c detected
> > ST16C2552 as
> > > 16450,sometimes as 8250,can anyone tell me why?
> > >
> > > !!!!!!!!!!!!!!!!Yuxiao Xi
> > > !!!!!!!!!!!!!!!!xiyuxiao@harbournetworks.com
> > > !!!!!!!!!!!!!!!!!!!!2003-09-18
> > >
> >
> >
> >
>
>
>
> <Gary Milliorn (E-mail).vcf>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about UART ST16C2552
@ 2003-09-19 1:39 Yuxiao Xi
0 siblings, 0 replies; 6+ messages in thread
From: Yuxiao Xi @ 2003-09-19 1:39 UTC (permalink / raw)
To: Kumar Gala; +Cc: linuxppc-embedded@lists.linuxppc.org
Yes,I have an external DUART ST16C2552.
Kumar,should ST16C2552 be detected as 16550A?
When and where can I get the patch for the on-chip UART you said?
Thanks.
> -----Original Message-----
> From: Kumar Gala [mailto:kumar.gala@motorola.com]
>Thanks for the correction. I guess my comments really apply to 8241,
>8245 and 8540 then.
>
>On Thursday, September 18, 2003, at 11:23 AM, Milliorn Gary-rxcr80 wrote:
>
>> There is no DUART on the MPC8240, if 8240 is what he literally
>> meant. Some boards, like Unity, used to have an external DUART
>> for this reason.
>>
>> > -----Original Message-----
>> > From: Kumar Gala [mailto:kumar.gala@motorola.com]
>> > Sent: Thursday, September 18, 2003 11:01 AM
>> > Subject: Re: question about UART ST16C2552
>> >
>> > For 824x the detection code for the on-chip UART does NOT currently
>> > detect it as a 16550A. There is a patch that Tom Rini and I are
>> > working on getting accepted by the serial maintainers, that should
>> > fix this.
>> >
>> > However, its not clear to me from your email if you also have a
>> > ST16C2552 in addition to the DUART on the 8240.
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Yuxiao Xi
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡xiyuxiao@harbournetworks.com
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-19
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about UART ST16C2552
[not found] <200309190129.h8J1TcaJ006055@motgate5.mot.com>
@ 2003-09-19 6:24 ` Kumar Gala
0 siblings, 0 replies; 6+ messages in thread
From: Kumar Gala @ 2003-09-19 6:24 UTC (permalink / raw)
To: Yuxiao Xi; +Cc: linuxppc-embedded
Acutally, I misunderstood your question. The patch I've listed below
is to make the DUART on 8241/8245/8540 be detected correctly as a
16550A. The current code detects it as a startech uart.
diff -u -3 -t -p -r1.1.1.1 serial.c
--- serial.c 2003/09/05 22:29:42 1.1.1.1
+++ serial.c 2003/09/19 06:22:09
@@ -3741,13 +3741,17 @@ static void autoconfig(struct serial_sta
/* Check for Startech UART's */
serial_outp(info, UART_LCR, UART_LCR_DLAB);
if (serial_in(info, UART_EFR) == 0) {
- state->type = PORT_16650;
+ serial_outp(info, UART_EFR, 0xA8);
+ if (serial_in(info, UART_EFR) != 0)
+ state->type = PORT_16650;
+ serial_outp(info, UART_EFR, 0);
} else {
serial_outp(info, UART_LCR, 0xBF);
if (serial_in(info, UART_EFR) == 0)
autoconfig_startech_uarts(info, state,
flags);
}
}
- kumar
On Thursday, September 18, 2003, at 08:39 PM, Yuxiao Xi wrote:
> Yes,I have an external DUART ST16C2552.
> Kumar,should ST16C2552 be detected as 16550A?
> When and where can I get the patch for the on-chip UART you said?
> Thanks.
>
>
>
>
>
>> Thanks for the correction. I guess my comments really apply to 8241,
>> 8245 and 8540 then.
>>
>> - kumar
>>
>> On Thursday, September 18, 2003, at 11:23 AM, Milliorn Gary-rxcr80
>> wrote:
>>
>>> Kumar,
>>>
>>> There is no DUART on the MPC8240, if 8240 is what he literally
>>> meant. Some boards, like Unity, used to have an external DUART
>>> for this reason.
>>>
>>> Gary Milliorn
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: Kumar Gala [mailto:kumar.gala@motorola.com]
>>>> Sent: Thursday, September 18, 2003 11:01 AM
>>>> To: Yuxiao Xi
>>>> Cc: linuxppc-embedded
>>>> Subject: Re: question about UART ST16C2552
>>>>
>>>>
>>>>
>>>> For 824x the detection code for the on-chip UART does NOT currently
>>>> detect it as a 16550A. There is a patch that Tom Rini and I are
>>>> working on getting accepted by the serial maintainers, that should
>>> fix
>>>> this.
>>>>
>>>> However, its not clear to me from your email if you also have a
>>>> ST16C2552 in addition to the DUART on the 8240.
>>>>
>>>> - kumar
>>>>
>
>
>
> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Yuxiao Xi
> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡xiyuxiao@harbournetworks.com
> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2003-09-19
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
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2003-09-19 6:24 ` Kumar Gala
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2003-09-18 16:00 ` Kumar Gala
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