diff options
| author |   Ralf Baechle <ralf@linux-mips.org> | 2007-09-14 19:08:43 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-09-14 19:08:43 +0100 |
| commit | 50da469a79fa2152d824f25f5ad5962f4af4343d (patch) | |
| tree | e05ba4976480cda10dca6aa5bae8b90784040eea /arch/mips | |
| parent | [MIPS] Workaround for 4Kc machine check exception (diff) | |
| download | linux-dev-50da469a79fa2152d824f25f5ad5962f4af4343d.tar.xz linux-dev-50da469a79fa2152d824f25f5ad5962f4af4343d.zip | |
[MIPS] 20Kc: Disable use of WAIT instruction.
Another issue with 20Kc's WAIT, waiting for more details. With the
2.6.23 release immindent simply disable the use of WAIT instead of a
more fancy workaround.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 06448a9656dc..3e004161ebd5 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -199,7 +199,14 @@ static inline void check_wait(void) if ((c->processor_id & 0xff) <= 0x64) break; - cpu_wait = r4k_wait; + /* + * Another rev is incremeting c0_count at a reduced clock + * rate while in WAIT mode. So we basically have the choice + * between using the cp0 timer as clocksource or avoiding + * the WAIT instruction. Until more details are known, + * disable the use of WAIT for 20Kc entirely. + cpu_wait = r4k_wait; + */ break; case CPU_RM9000: if ((c->processor_id & 0x00ff) >= 0x40) |