Help with serial synths in 4.X kernels

[John G Heim]

I wrote a quick perl script to scan /proc/ioports for an address. It 
shows that the port 0x3f8 is within the range covered by this line from 
/proc/ioports:

0000-0cf7 : PCI Bus 0000:00

PS: I put the script where anyone can download it, 
http://www.math.wisc.edu/~jheim/debian/ioportscan. By default it scans 
for 0x3f8 but you cn pass any hex number as a parameter.



On 03/04/2016 05:19 PM, Samuel Thibault wrote:
> Hello,
>
> John G Heim, on Fri 04 Mar 2016 13:50:31 -0600, wrote:
>> Is your patch supposed to take the place of that lame patch I used to post
>> that just commented out the return code?
> No. Both are needed.
>
>> I edited /default/grub and added"
>>
>> 8250.nr_uarts=0".
> That, however, is supposed to save having to use the lame patch: it just
> disables the 8250 driver which conflicts with speakup.
>
>> Then I compiled a kernel with your patch and installed it. But saying "modprobe speakup_ltlk" doesn't work and generates error messages in the syslog. I've cut/pasted them below. I am guessing the key line is the one that says, " Unable to allocate port at 3f8, errno -16".
> That's odd. Are you sure the 8250.nr_uarts=0 parameter is effective?
> Check in /proc/cmdline and you can also check in /proc/ioports what
> driver is keeping them busy.
>
> Samuel

-- 
--
John G. Heim; jheim at math.wisc.edu; sip://jheim@sip.linphone.org