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| author | wdenk <wdenk> | 2004-01-31 20:06:54 +0000 |
|---|---|---|
| committer | wdenk <wdenk> | 2004-01-31 20:06:54 +0000 |
| commit | 75d1ea7f6aa00c280c495a1ff6502f091c4244fe (patch) | |
| tree | bb1ee058f8886ae42cb85a6b2c82f3d6b18661bf /README | |
| parent | 6876609446980c3055bbd32c195a63330e21d8e6 (diff) | |
| download | blackbird-obmc-uboot-75d1ea7f6aa00c280c495a1ff6502f091c4244fe.tar.gz blackbird-obmc-uboot-75d1ea7f6aa00c280c495a1ff6502f091c4244fe.zip | |
Fix variable CPU clock for MPC859/866 systems for low CPU clocks
Diffstat (limited to 'README')
| -rw-r--r-- | README | 18 |
1 files changed, 17 insertions, 1 deletions
@@ -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 |
