On 2018-01-24 04:55 PM, Adam Jackson wrote:
> On Wed, 2018-01-24 at 01:12 +0000, Alex Bowden wrote:
>>
>> I have a Thinkpad 240 with a Neomagic NM2160 and I keep having an issue
>> with the neomagic driver. I think I have narrowed it down to the kernel
>> refusing to mmap the framebuffer. I created a program called testneo.c
>> to attempt to use pci_device_map_range to access the framebuffer but
>> it always returns 22 (Invalid argument).
>
> I'm not sure why that would fail, but...
It could be related to the Linux kernel's CONFIG_IO_STRICT_DEVMEM,
excerpt from the corresponding help text:
If this option is switched on, the /dev/mem file only allows
userspace access to *idle* io-memory ranges (see /proc/iomem) This
may break traditional users of /dev/mem (dosemu, legacy X, etc...)
if the driver using a given range cannot be disabled.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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