Hi,

CONFIG_SYS_CLK_FREQ is the input frequency of 405GP's clocking system. The internal PLL uses this frequency and the division parameters strapped from IO pins at power on reset to generate the different clocks needed in 405GP. You can find the detail description about 405GP's clock system in 405GP's user manual, which can be downloaded from IBM's website.

yuwp

From: "Frank Young" young726@hotmail.com To: u-boot-users@lists.sourceforge.net Date: Thu, 03 Jun 2004 14:19:44 -0400 Subject: [U-Boot-Users] Where is the CPU clock speed definition

Hi,

I am using a WALNUT with PPC405 200MHz CPU. I am trying to install the u-boot on this board. I have built the image. But before I put the image

to

the flash, I want to confirm one thing: do I have to configure the CPU

speed

for this board? I checked the file include/configs/WALNUT405.h. I only

found

a definition for CONFIG_SYS_CLK_FREQ, which is for external clock. Where

is

the CPU clock frequency defined?

Thanks!

Frank