On 02/19/13 23:45, David Woodhouse wrote:
I'm beginning to wish I'd just ignored the fact that we need a properly working "soft" reset to get back from 286 protected mode to real mode, and wired up the damn PAM reset unconditionally. I'm not convinced that the protected->real mode transition will work for anyone anyway.
I believe currently we must be somewhere "between" soft reset & hard reset. I estimate getting closer to a well-emulated hard reset is more important than getting closer to a soft one. If you were to extend the i440FX reset handler so that it unconditionally resets the PAMs, I'd give my Rb. (Take it for what it's worth :))
The long-term solution covering all targets is being designed, but a quick shortcut would be nice, and not only for CSM development / testing. (I gather qemu_prep_reset() in SeaBIOS would not have had to be written that way, for example.) For CSM stuff we can still carry private qemu patches of course...
Thanks Laszlo