Re: [Qemu-devel] [PATCH 1/4] Split serial-isa into its own config option

[Peter Maydell <peter.maydell@linaro.org>]

On 29 June 2015 at 06:36, David Gibson <david@gibson.dropbear.id.au> wrote:
> At present, the core device model code for 8250-like serial ports
> (serial.c) and the code for serial ports attached to ISA-style legacy IO
> (serial-isa.c) are both controlled by the CONFIG_SERIAL variable.
>
> There are lots and lots of embedded platforms that have 8250-like serial
> ports but have never had anything resembling ISA legacy IO.  Therefore,
> split serial-isa into its own CONFIG_SERIAL_ISA option so it can be
> disabled for platforms where it's not appropriate.
>
> For now, I enabled CONFIG_SERIAL_ISA in every default-config where
> CONFIG_SERIAL is enabled, excepting microblaze, xtensa and or32.  Those
> platforms have technically lost functionality, but since they have no
> other PCI or ISA devices, it's fairly clear they never actually used
> leagacy IO stuff.

s/leagacy/legacy/

Is it worth having a default-configs/isa.mak along the
lines of our current pci.mak and usb.mak, for putting
CONFIG_ defines for all ISA devices?

A quick grep suggests you can knock arm, moxie, sh4
and sh4eb off your list of things with CONFIG_SERIAL_ISA
(no hits for ISABus).

I notice in passing that we still have a handful of config
files which set CONFIG_ISA_MMIO, despite that having been
deleted in commit 61fcb628627ea4 two years ago.

thanks
-- PMM