Hello, l-k.
On my ThinkPad 600, The ThinkPad PnP BIOS configures
all PnP devices at boot time.
If I load the isa-pnp.o driver it never detects any ISA PnP
devices: it says "isapnp: No Plug & Play device found". This
is unfortunate, because it means that device drivers can't
find out from isa-pnp where the devices are.
David Hinds's pcmcia-cs package contains driver code that
interfaces with the PnP BIOS. With it, one can list the resource
usage of ISA PnP devices (serial and parallel ports, sound chip,
etc.) and set them, using the "lspnp" and "setpnp" commands.
Would it not be useful if the isa-pnp driver would fall back
to utilizing the PnP BIOS (if possible) in order to read and
change ISA PnP device configurations when it can't do this
itself? If so, could this perhaps be done by bringing the Hinds
PnP BIOS driver into the kernel and interfacing isa-pnp to it?
Thomas Hood
jdthood_AT_yahoo.co.uk <- Change '_AT_' to '@'
Thomas Hood wrote:
> On my ThinkPad 600, The ThinkPad PnP BIOS configures
> all PnP devices at boot time.
>
> If I load the isa-pnp.o driver it never detects any ISA PnP
> devices: it says "isapnp: No Plug & Play device found". This
> is unfortunate, because it means that device drivers can't
> find out from isa-pnp where the devices are.
>
> David Hinds's pcmcia-cs package contains driver code that
> interfaces with the PnP BIOS. With it, one can list the resource
> usage of ISA PnP devices (serial and parallel ports, sound chip,
> etc.) and set them, using the "lspnp" and "setpnp" commands.
>
> Would it not be useful if the isa-pnp driver would fall back
> to utilizing the PnP BIOS (if possible) in order to read and
I would find this EXTREMELY usefull... my Compaq laptop's
hot-dock with power eject will only work if Linux uses
PnP BIOS's insert/eject methods.
I saw some code in early 2.3 that would talk to bios, i still have
a tarball, but it seems 2.4 only does hardware banging (best in
*most* cases...)
>
> change ISA PnP device configurations when it can't do this
> itself? If so, could this perhaps be done by bringing the Hinds
> PnP BIOS driver into the kernel and interfacing isa-pnp to it?
>> Would it not be useful if the isa-pnp driver would fall back
>> to utilizing the PnP BIOS (if possible) in order to read and
>
>I would find this EXTREMELY usefull... my Compaq laptop's
>hot-dock with power eject will only work if Linux uses
>PnP BIOS's insert/eject methods.
>
>I saw some code in early 2.3 that would talk to bios, i still have
>a tarball, but it seems 2.4 only does hardware banging (best in
>*most* cases...)
There are some desktop m/boards that don't seem to respond to the
kernel-mode ISA-PnP at the moment, too. Particularly my Abit KT7 - I have
to use user-mode ISA-PnP for it to pick up my nice SB AWE-64. This needs
fixing somehow, and maybe looking at the PnP BIOS stuff is the right way.
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Okay, a couple of people have responded positively to this
suggestion. The next question is, how should it be implemented?
How 'bout:
$ cd pcmcia-cs/modules
$ cp pnp_bios.c pnp_proc.c pnp_rsrc.c /usr/src/linux/2.4.2a/drivers/pnp
$ cd ../include/linux
$ cp pnp_bios.h pnp_resource.h /usr/src/linux/2.4.2a/include/linux
Edit makefiles
Edit isapnp.c to include new global flag "isapnp_usepnpbios",
a MODULE_PARM, which each isapnp function checks at entry.
If the flag is set then: in the case of "low-level" functions,
return immediately; in the case of "high-level" functions, call
appropriate pnp_bios functions to perform the task; in the case
of isapnp_init(), just check isapnp_disabled and exit. isapnp's
/proc interface would not be supported. Presumably
inter_module_get_request() would be used to call the isapnp-bios
routines.
Comments? (Go easy on me; I'm a newbie at kernel hacking.)
Thomas
> Hello, l-k.
>
> On my ThinkPad 600, The ThinkPad PnP BIOS configures
> all PnP devices at boot time.
>
> If I load the isa-pnp.o driver it never detects any ISA PnP
> devices: it says "isapnp: No Plug & Play device found". This
> is unfortunate, because it means that device drivers can't
> find out from isa-pnp where the devices are.
>
> David Hinds's pcmcia-cs package contains driver code that
> interfaces with the PnP BIOS. With it, one can list the resource
> usage of ISA PnP devices (serial and parallel ports, sound chip,
> etc.) and set them, using the "lspnp" and "setpnp" commands.
>
> Would it not be useful if the isa-pnp driver would fall back
> to utilizing the PnP BIOS (if possible) in order to read and
> change ISA PnP device configurations when it can't do this
> itself? If so, could this perhaps be done by bringing the Hinds
> PnP BIOS driver into the kernel and interfacing isa-pnp to it?
>
> Thomas Hood
> jdthood_AT_yahoo.co.uk <- Change '_AT_' to '@'