xr_usb_serial_common limited to 32 devices
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I'm using 64 serial devices connected to one machine with Ubuntu 18.04 LTS.
All devices are from Exar Corp. It worked like a charm with 32 devices but failed with 64. Only 32 /dev/ttyXRUSB* got created.
Dmesg error some times:
no more free xr_usb_serial devices
Google didn't get me any results and after many trial & error this solved the problem. So maybe someone will find this information useful:
- Downloaded driver source from exar
In
xr_usb_serial_common.hI changed line 30 to#define XR_USB_SERIAL_TTY_MINORS 64Compile,
insmodand disabled/blacklisted old driver.
So it works, but I don't know exactly what I've caused and if there any side effects?
linux drivers
edited Jul 18 at 11:44
slm♦
232k65479649
asked Jul 18 at 9:46
Christian
61
add a comment |Â
up vote
1
down vote
favorite
I'm using 64 serial devices connected to one machine with Ubuntu 18.04 LTS.
All devices are from Exar Corp. It worked like a charm with 32 devices but failed with 64. Only 32 /dev/ttyXRUSB* got created.
Dmesg error some times:
no more free xr_usb_serial devices
Google didn't get me any results and after many trial & error this solved the problem. So maybe someone will find this information useful:
- Downloaded driver source from exar
In
xr_usb_serial_common.hI changed line 30 to#define XR_USB_SERIAL_TTY_MINORS 64Compile,
insmodand disabled/blacklisted old driver.
So it works, but I don't know exactly what I've caused and if there any side effects?
linux drivers
edited Jul 18 at 11:44
slm♦
232k65479649
asked Jul 18 at 9:46
Christian
61
Probably no side effects: The driver needs to reserve space to hold information for the devices. Now you've allocated more space, which is wasteful for those not needing as many devices (most people won't), but otherwise harmless.
– dirkt
Jul 18 at 12:26
Thanks :-) Seems that no problems occured since two days.
– Christian
Jul 19 at 19:04
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm using 64 serial devices connected to one machine with Ubuntu 18.04 LTS.
All devices are from Exar Corp. It worked like a charm with 32 devices but failed with 64. Only 32 /dev/ttyXRUSB* got created.
Dmesg error some times:
no more free xr_usb_serial devices
Google didn't get me any results and after many trial & error this solved the problem. So maybe someone will find this information useful:
- Downloaded driver source from exar
In
xr_usb_serial_common.hI changed line 30 to#define XR_USB_SERIAL_TTY_MINORS 64Compile,
insmodand disabled/blacklisted old driver.
So it works, but I don't know exactly what I've caused and if there any side effects?
linux drivers
edited Jul 18 at 11:44
slm♦
232k65479649
asked Jul 18 at 9:46
Christian
61
I'm using 64 serial devices connected to one machine with Ubuntu 18.04 LTS.
All devices are from Exar Corp. It worked like a charm with 32 devices but failed with 64. Only 32 /dev/ttyXRUSB* got created.
Dmesg error some times:
no more free xr_usb_serial devices
Google didn't get me any results and after many trial & error this solved the problem. So maybe someone will find this information useful:
- Downloaded driver source from exar
In
xr_usb_serial_common.hI changed line 30 to#define XR_USB_SERIAL_TTY_MINORS 64Compile,
insmodand disabled/blacklisted old driver.
So it works, but I don't know exactly what I've caused and if there any side effects?
linux drivers
edited Jul 18 at 11:44
slm♦
232k65479649
asked Jul 18 at 9:46
Christian
61
edited Jul 18 at 11:44
slm♦
232k65479649
edited Jul 18 at 11:44
slm♦
232k65479649
edited Jul 18 at 11:44
slm♦
232k65479649
232k65479649
asked Jul 18 at 9:46
Christian
61
asked Jul 18 at 9:46
Christian
61
asked Jul 18 at 9:46
Christian
61
61
Probably no side effects: The driver needs to reserve space to hold information for the devices. Now you've allocated more space, which is wasteful for those not needing as many devices (most people won't), but otherwise harmless.
– dirkt
Jul 18 at 12:26
Thanks :-) Seems that no problems occured since two days.
– Christian
Jul 19 at 19:04
add a comment |Â
Probably no side effects: The driver needs to reserve space to hold information for the devices. Now you've allocated more space, which is wasteful for those not needing as many devices (most people won't), but otherwise harmless.
– dirkt
Jul 18 at 12:26
Thanks :-) Seems that no problems occured since two days.
– Christian
Jul 19 at 19:04
Probably no side effects: The driver needs to reserve space to hold information for the devices. Now you've allocated more space, which is wasteful for those not needing as many devices (most people won't), but otherwise harmless.
– dirkt
Jul 18 at 12:26
Probably no side effects: The driver needs to reserve space to hold information for the devices. Now you've allocated more space, which is wasteful for those not needing as many devices (most people won't), but otherwise harmless.
– dirkt
Jul 18 at 12:26
Thanks :-) Seems that no problems occured since two days.
– Christian
Jul 19 at 19:04
Thanks :-) Seems that no problems occured since two days.
– Christian
Jul 19 at 19:04
add a comment |Â
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Probably no side effects: The driver needs to reserve space to hold information for the devices. Now you've allocated more space, which is wasteful for those not needing as many devices (most people won't), but otherwise harmless.
– dirkt
Jul 18 at 12:26
Thanks :-) Seems that no problems occured since two days.
– Christian
Jul 19 at 19:04