/dev/ttyS1 can not be used : io error

David Reyes Samblas Martinez david at tuxbrain.com
Sat Apr 17 18:42:09 EDT 2010


Hi Xianfu,
Any posibility to have a bootloader this second serial enabled  ready to flash?
Regards

2010/4/11 Xiangfu Liu <xiangfu at sharism.cc>:
> Hi Guylhem
>
> the ttyS1 have stop in bootloader.
> so you need enable the UART1 in bootloader.
>
> On 04/11/2010 08:20 AM, Guylhem Aznar wrote:
>>
>> Hello
>>
>> I did hook up the bluetooth chip to RX2 and TX2, but I have a strange
>> io problem:
>> root at BenNanoNote:~# hciattach /dev/ttyS1 csr 115200
>> Can't get port settings: Input/output error
>> Can't initialize device: Input/output error
>>
>> Apparently, trying to access the 2nd serial port gives io errors,
>> while the 1st one works fine
>> root at BenNanoNote:~# cat /dev/ttyS1
>> cat: read error: Input/output error
>> root at BenNanoNote:~# cat /dev/ttyS0
>> ^C
>>
>> Any idea why? I see the port in /dev so I guess it is detected.
>> However it is not listed in dmesg:
>> root at BenNanoNote:~# dmesg|grep -i tty
>> [    0.000000] Kernel command line: mem=32M console=ttyS0,57600n8
>> ubi.mtd=2 rootfstype=ubifs root=ubi0:rootfs rw rootwait
>> [    0.000000] console [ttyS0] enabled, bootconsole disabled
>> [    0.660000] serial8250: ttyS0 at MMIO 0x0 (irq = 17) is a 16550A
>>
>> I'd prefer keeping the 1st serial port free, in case I need it later
>> because it is accessible without removing the screws, and because it's
>> used as the serial console too.
>>
>> Guylhem
>>
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>
>
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-- 
David Reyes Samblas Martinez
http://www.tuxbrain.com
Open ultraportable & embedded solutions
Ben NanoNote, Arduino, Openmoko
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