The simplest way for shortcutting...

#define CONFIG_SYS_CLK_FREQ get_clock_freq()

(writing of an acceptable get_clock_freq()is left as an exercize for the reader)

gvb

-----Original Message----- From: u-boot-users-admin@lists.sourceforge.net [mailto:u-boot-users-admin@lists.sourceforge.net]On Behalf Of Wolfgang Denk Sent: Thursday, April 22, 2004 1:15 PM To: Kumar Gala Cc: U-Boot mailing list Subject: Re: [U-Boot-Users] dynamic setting of CONFIG_SYS_CLK_FREQ

In message 66FC73FC-9476-11D8-A48D-000393DBC2E8@motorola.com you wrote:

...

I was wondering if there where an examples in the current

u-boot source

...

tree in which CONFIG_SYS_CLK_FREQ was determined

dynamically. I have a

Not exactly for CONFIG_SYS_CLK_FREQ - but the TQM8xxL boards contain code to measure the input clock against the (known) 32kHz clock.

...

system in which I can read a config register on the board to let me know if the CONFIG_SYS_CLK_FREQ is 66Mhz or 33Mhz. I was hoping to have the 16550 uart (and anything else) that needed

CONFIG_SYS_CLK_FREQ

...

grab it from a variable instead.

If you provide a suitable init fuction which sets the value in the global data section eraly enough, you can probably shortcut the use of CONFIG_SYS_CLK_FREQ.

...

This is on an MPC85xx platform system.

...or any other.

Best regards,

Wolfgang Denk

-- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de "There are three principal ways to lose money: wine, women, and engi- neers. While the first two are more pleasant, the third is by far the more certain." - Baron Rothschild, ca. 1800

---

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