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Commit 675ec7a5 authored by Grant Grundler's avatar Grant Grundler Committed by Kyle McMartin
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[PARISC] Document history of PDC_NARROW as it is now obsolete 



Document history of PDC_NARROW a bit as it will still show
up in an older kernel's .config file.

Signed-off-by: default avatarGrant Grundler <grundler@parisc-linux.org>

Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent c8e8b193

arch/parisc/kernel/firmware.c

+8 −8
Original line number Diff line number Diff line
@@ -83,15 +83,15 @@ static unsigned long pdc_result2[32] __attribute__ ((aligned (8))); 
int parisc_narrow_firmware = 1;

#endif



/* on all currently-supported platforms, IODC I/O calls are always

 * 32-bit calls, and MEM_PDC calls are always the same width as the OS.

 * This means Cxxx boxes can't run wide kernels right now. -PB

/* On most currently-supported platforms, IODC I/O calls are 32-bit calls

 * and MEM_PDC calls are always the same width as the OS.

 * Some PAT boxes may have 64-bit IODC I/O.

 *

 * CONFIG_PDC_NARROW has been added to allow 64-bit kernels to run on

 * systems with 32-bit MEM_PDC calls. This will allow wide kernels to

 * run on Cxxx boxes now. -RB

 *

 * Note that some PAT boxes may have 64-bit IODC I/O...

 * Ryan Bradetich added the now obsolete CONFIG_PDC_NARROW to allow

 * 64-bit kernels to run on systems with 32-bit MEM_PDC calls.

 * This allowed wide kernels to run on Cxxx boxes.

 * We now detect 32-bit-only PDC and dynamically switch to 32-bit mode

 * when running a 64-bit kernel on such boxes (e.g. C200 or C360).

 */



#ifdef __LP64__