Hello,

> > > I also swap CPUs from time to time and
> > > I'd rather have the L2 configuring not hard coded into the kernel.
> > Sure. I only did it because it was the only way to get the L2 cache enabled at all.
> 
> hey, how do i enable L2 cache by hand in the kernel?  and what do i need to know
> to get it setup right?  it's a 400Mhz Sonnet G3 card.

Figure out the cache's size and clock ratio, then add something like this to your kernel config ( and config, make depend, make... )
options         L2CR_CONFIG="(L2SIZ_1M|L2CLK_20|L2RAM_PIPELINE_BURST)"
This is what I did for my 300MHz G3 with 1MB cache at 150MHz, so clock ratio is 2, there are other macros for different sizes...
#define    L2SIZ_256K             0x10000000
#define    L2SIZ_512K             0x20000000
#define    L2SIZ_1M               0x30000000
... ratios ...
#define    L2CLK_DIS              0x00000000 /* disable L2 clock */
#define    L2CLK_10               0x02000000 /* core clock / 1   */
#define    L2CLK_15               0x04000000 /*            / 1.5 */
#define    L2CLK_35               0x06000000 /*            / 3.5 */
#define    L2CLK_20               0x08000000 /*            / 2   */
#define    L2CLK_25               0x0a000000 /*            / 2.5 */
#define    L2CLK_30               0x0c000000 /*            / 3   */
#define    L2CLK_40               0x0e000000 /*            / 4   */
... and types...
#define    L2RAM_FLOWTHRU_BURST   0x00000000
#define    L2RAM_PIPELINE_BURST   0x01000000
#define    L2RAM_PIPELINE_LATE    0x01800000

have fun
Michael