btw. Now it's a perfect chance for Genesi to include a rom socket for AOS4 enabler/dongle in the peg2. And perhaps a ROM switcher in the BIOS/bootROM.
What BIOS? The BootROM you're talking about is the very thing you're talking about changing. The Teron and Pegasos use two different BootROM mechanisms. Teron's use Hyperions new PPCBoot system while Pegasos uses the industry standard OpenFirmware approach. To allow the Pegasos to use the A1 dongle you'd break the design, resulting in the cards you've carefully elected to install no longer operating in their prescribed manner.
You see, OpenFirmware is a similar concept to AutoConfig, with an OS-neutral basic configuration driver incorporated into the ROM on both the motherboard and the peripheral cards. This provides a near complete HAL to allow the Operating Systems using it to streamline the hardware validation process and thereby improve system performance. The OF tackles all of this, including a much improved plug n play system on par with that of the original Amiga.
PPCBoot, from what I've read, appears to utilize the x86 boot ROM's on most cards to provide a crude portmap of the card. The OS still must take care of the I/O arbitration, which cards get what resources, mapping out the system call layout, etc. While on the surface, being able to utilize the x86 card ROM's is good in that you don't require an OF compatable card, the end result is more overhead for any operating systems utilizing it.
Of course, you already knew this, right?