* Porting a driver from x86 to LinucPPC
@ 1998-12-16 10:06 Bryan Christianson
1998-12-18 10:46 ` Jens Ch. Restemeier
0 siblings, 1 reply; 3+ messages in thread
From: Bryan Christianson @ 1998-12-16 10:06 UTC (permalink / raw
To: linuxppc-dev
I'm trying to port a device driver from x86 to linuxppc. I am running into
problems with big/little endian-ness.
The device is a PCI card. Do I need to explicitly translate the data
between big-endian and little-endian or will the io routines (outl, inl and
inw) take care of this for me? On x86 I didn't even think about this issue,
but now I have a feeling that maybe I should have.
--
Bryan Christianson
email: <mailto:bryanc@ihug.co.nz>
Home Page: <http://crash.ihug.co.nz/~bryanc>
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* Re: Porting a driver from x86 to LinucPPC
1998-12-16 10:06 Porting a driver from x86 to LinucPPC Bryan Christianson
@ 1998-12-18 10:46 ` Jens Ch. Restemeier
1998-12-19 10:34 ` Bryan Christianson
0 siblings, 1 reply; 3+ messages in thread
From: Jens Ch. Restemeier @ 1998-12-18 10:46 UTC (permalink / raw
To: Bryan Christianson; +Cc: linuxppc-dev
Bryan Christianson wrote:
>
> I'm trying to port a device driver from x86 to linuxppc. I am running into
> problems with big/little endian-ness.
>
> The device is a PCI card. Do I need to explicitly translate the data
> between big-endian and little-endian or will the io routines (outl, inl and
> inw) take care of this for me? On x86 I didn't even think about this issue,
> but now I have a feeling that maybe I should have.
I just fixed the NE2000 driver for this.
inl/outl will fix PCI's liddle-endianess to host-endianness. There is
some documentation in include/asm/io.h.
Jens
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Porting a driver from x86 to LinucPPC
1998-12-18 10:46 ` Jens Ch. Restemeier
@ 1998-12-19 10:34 ` Bryan Christianson
0 siblings, 0 replies; 3+ messages in thread
From: Bryan Christianson @ 1998-12-19 10:34 UTC (permalink / raw
To: jenschrr; +Cc: linuxppc-dev
>Bryan Christianson wrote:
>>
>> I'm trying to port a device driver from x86 to linuxppc. I am running into
>> problems with big/little endian-ness.
>>
>> The device is a PCI card. Do I need to explicitly translate the data
>> between big-endian and little-endian or will the io routines (outl, inl and
>> inw) take care of this for me? On x86 I didn't even think about this issue,
>> but now I have a feeling that maybe I should have.
>
>I just fixed the NE2000 driver for this.
>
>inl/outl will fix PCI's liddle-endianess to host-endianness. There is
>some documentation in include/asm/io.h.
>
Thanks - I've got the thing working now. The inl/outl stuff worked fine,
but this card also uses inw. I had to flip the bytes on the returned value
and the card burst into life.
Bryan
--
Bryan Christianson
email: <mailto:bryanc@ihug.co.nz>
Home Page: <http://crash.ihug.co.nz/~bryanc>
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^ permalink raw reply [flat|nested] 3+ messages in thread
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1998-12-16 10:06 Porting a driver from x86 to LinucPPC Bryan Christianson
1998-12-18 10:46 ` Jens Ch. Restemeier
1998-12-19 10:34 ` Bryan Christianson
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