Messages in this thread Patch in this message |  | | From | David Woodhouse <> | Subject | [PATCH] Fix SH3 CPU speed detection. | Date | Thu, 19 Oct 2000 08:46:30 +0100 |
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The timing loop used for CPU speed detection on SH takes 5 cycles instead of 4 on SH3 if it's not word-aligned. SH4 may want recalibrating, given the 'I don't know why, but it appears to take 6 cycles' comment.
Index: arch/sh/kernel/time.c =================================================================== RCS file: /inst/cvs/linux/arch/sh/kernel/Attic/time.c,v retrieving revision 1.1.2.13 diff -u -r1.1.2.13 time.c --- arch/sh/kernel/time.c 2000/10/04 12:29:25 1.1.2.13 +++ arch/sh/kernel/time.c 2000/10/19 07:42:31 @@ -337,6 +337,7 @@ do {} while (ctrl_inb(R64CNT) != 0); ctrl_outb(RCR1_CIE, RCR1); /* Enable carry interrupt */ asm volatile( + ".align 2\n\t" "1:\t" "tst %1,%1\n\t" "bt/s 1b\n\t"
-- dwmw2
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