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authorGrant Grundler <grundler@parisc-linux.org>2005-10-21 22:51:40 -0400
committerKyle McMartin <kyle@parisc-linux.org>2005-10-21 22:51:40 -0400
commit675ec7a56a77da2dda27180c95ee82ae4879142a (patch)
tree2b31efafa8306c1e60d9773a0cc61b5eb3f16b4c /arch/parisc/kernel
parentc8e8b1937a788ec46ee11d84437311d4cb8be218 (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/parisc/kernel')
-rw-r--r--arch/parisc/kernel/firmware.c16
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__