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authorwdenk <wdenk>2004-01-31 20:06:54 +0000
committerwdenk <wdenk>2004-01-31 20:06:54 +0000
commit75d1ea7f6aa00c280c495a1ff6502f091c4244fe (patch)
treebb1ee058f8886ae42cb85a6b2c82f3d6b18661bf /README
parent6876609446980c3055bbd32c195a63330e21d8e6 (diff)
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Fix variable CPU clock for MPC859/866 systems for low CPU clocks
Diffstat (limited to 'README')
-rw-r--r--README18
1 files changed, 17 insertions, 1 deletions
diff --git a/README b/README
index 58267f1..61d55d4 100644
--- a/README
+++ b/README
@@ -415,12 +415,28 @@ The following options need to be configured:
Define exactly one of
CONFIG_MPC8240, CONFIG_MPC8245
-- 8xx CPU Options: (if using an 8xx cpu)
+- 8xx CPU Options: (if using an MPC8xx cpu)
Define one or more of
CONFIG_8xx_GCLK_FREQ - if get_gclk_freq() cannot work
e.g. if there is no 32KHz
reference PIT/RTC clock
+- 859/866 CPU options: (if using a MPC859 or MPC866 CPU):
+ CFG_866_OSCCLK
+ CFG_866_CPUCLK_MIN
+ CFG_866_CPUCLK_MAX
+ CFG_866_CPUCLK_DEFAULT
+ See doc/README.MPC866
+
+ CFG_MEASURE_CPUCLK
+
+ Define this to measure the actual CPU clock instead
+ of relying on the correctness of the configured
+ values. Mostly useful for board bringup to make sure
+ the PLL is locked at the intended frequency. Note
+ that this requires a (stable) reference clock (32 kHz
+ RTC clock),
+
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ