Hi Will, On 19 April 2013 14:35, Will Deacon will.deacon@arm.com wrote:
Hello,
On Thu, Apr 18, 2013 at 09:48:49AM +0100, Pranavkumar Sawargaonkar wrote:
Actually i thought adding a config register will be easier to add a code than writing entire emulation as 8250 emulation will require to deal with dealing with more registers and more code.
kvmtool already has an 8250 emulation! All we need to do is hack together something which will allow us to instantiate those ioport devices in a more flexible manner (namely, inside the MMIO space for ARM). For earlyprintk, I suspect we can get away without an interrupt too, which should simplify things a bit to start with.
Regardless of the outcome of this discussion, I think getting the 8250 working on ARM is definitely something worth doing. If I get time, I'll take a look.
I am not against using 8250 emulation (as far as it solves printk issues for kernel booting logs), but my point is why not to add early read-write support for virtio console, which also can be useful in emulation less mach-virt environment also ?
Thanks, Pranav
Will