From: Grant Grundler Date: Sat, 22 Oct 2005 02:51:40 +0000 (-0400) Subject: [PARISC] Document history of PDC_NARROW as it is now obsolete X-Git-Tag: v2.6.15-rc1~732^2^2~9^2~22 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=675ec7a56a77da2dda27180c95ee82ae4879142a;p=linux-2.6 [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 Signed-off-by: Kyle McMartin --- diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index f244fb200d..553f8fe032 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__