diff options
| author | Grant Grundler <grundler@parisc-linux.org> | 2005-10-21 22:51:40 -0400 |
|---|---|---|
| committer | Kyle McMartin <kyle@parisc-linux.org> | 2005-10-21 22:51:40 -0400 |
| commit | 675ec7a56a77da2dda27180c95ee82ae4879142a (patch) | |
| tree | 2b31efafa8306c1e60d9773a0cc61b5eb3f16b4c /arch | |
| parent | c8e8b1937a788ec46ee11d84437311d4cb8be218 (diff) | |
[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: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/kernel/firmware.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index f244fb200db..553f8fe0322 100644 --- a/arch/parisc/kernel/firmware.c +++ b/arch/parisc/kernel/firmware.c @@ -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__ |