Re: possible deprecation and removal of some old QEMU Arm machine types (pxa2xx, omap, sa1110)

[Dmitry Baryshkov <dbaryshkov@gmail.com>]

On Thu, 15 Feb 2024 at 10:45, Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Thu, Feb 15, 2024, at 09:31, Andreas Kemnade wrote:
> > On Wed, 14 Feb 2024 23:42:58 +0100
> > "Arnd Bergmann" <arnd@arndb.de> wrote:
> >> On Wed, Feb 14, 2024, at 13:26, Dmitry Baryshkov wrote:
> >> > On Tue, 13 Feb 2024 at 23:22, Linus Walleij <linus.walleij@linaro.org> wrote:
> >> >> On Tue, Feb 13, 2024 at 9:12 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >> >> > On Tue, Feb 13, 2024, at 16:36, Guenter Roeck wrote:
> >> >> > > On Tue, Feb 13, 2024 at 03:14:21PM +0000, Peter Maydell wrote:
> >> >>
> >> >> Andrea Adami and Dmitry Eremin-Solenikov did the work in 2017 to
> >> >> modernize it a bit, and Russell helped out. I was under the impression
> >> >> that they only used real hardware though!
> >> >
> >> > I used both Qemu and actual hardware (having collie, poodle, tosa and
> >> > c860 that was easy).
> >> >
> >> > The biggest issue with Zaurus PDAs was that supporting interesting
> >> > parts of the platform (PCMCIA, companion chips) required almost
> >> > rebootstrapping of the corresponding drivers.
> >> > E.g. I had a separate driver for the LoCoMo chip which worked properly
> >> > with the DT systems.
> >> > PCMCIA was a huuuge trouble and it didn't play well at all. The driver
> >> > must be rewritten to use the component framework.
> >>
> >> If we want to actually go there, I think the best option for PCMCIA
> >> support is likely to replace the entire "soc_common" pcmcia driver
> >> with a simple drivers/pata/ storage driver and no support for
> >> other cards. There was a driver until commit 38943cbd25a2
> >> ("ata: remove palmld pata driver") that could serve as an
> >> template.
> >>
> > hmm, main usage for PCMCIA/CF in those devices was often something else,
> > not storage, at least on the IPAQ h2200. Wondering wether that road is
> > actually good. When I was mainly using those devices, I was not good in
> > mainlining things.
>
> Do we still support any non-storage CF devices that someone might
> actually use? Do you have a specific example in mind? These are
> the currently supported devices that I see:

The Bluetooth over the PCMCIA UART worked last time I checked it and
according to your grep it is still a valid user.

If we are talking about re-bootstrap of the PCMCIA subsystem, hostap
and orinoco come to my mind. We dropped those drivers a while ago, but
back at that time they were very useful. Also I had the out-of-tree
driver for Sharp 0.3 MP cameras using CF interface (yeah, sure, all of
those are out-of-tree nowadays).

>
> git grep -B4 -w depends.*PCMCIA | grep "Kconfig-\(config\|menuconfig\)" | grep -v ^drivers/pcmcia
> drivers/ata/Kconfig-config PATA_PCMCIA
> drivers/bluetooth/Kconfig-config BT_HCIDTL1
> drivers/bluetooth/Kconfig-config BT_HCIBT3C
> drivers/bluetooth/Kconfig-config BT_HCIBLUECARD
> drivers/comedi/Kconfig-menuconfig COMEDI_PCMCIA_DRIVERS
> drivers/mmc/host/Kconfig-config MMC_SDRICOH_CS
> drivers/mtd/maps/Kconfig-config MTD_PCMCIA
> drivers/mtd/maps/Kconfig-config MTD_PCMCIA_ANONYMOUS
> drivers/net/arcnet/Kconfig-menuconfig ARCNET
> drivers/net/arcnet/Kconfig-config ARCNET_COM20020_CS
> drivers/net/can/sja1000/Kconfig-config CAN_EMS_PCMCIA
> drivers/net/can/sja1000/Kconfig-config CAN_PEAK_PCMCIA
> drivers/net/can/softing/Kconfig-config CAN_SOFTING_CS
> drivers/net/ethernet/3com/Kconfig-config NET_VENDOR_3COM
> drivers/net/ethernet/3com/Kconfig-config PCMCIA_3C574
> drivers/net/ethernet/3com/Kconfig-config PCMCIA_3C589
> drivers/net/ethernet/8390/Kconfig-config PCMCIA_AXNET
> drivers/net/ethernet/8390/Kconfig-config APNE
> drivers/net/ethernet/8390/Kconfig-config PCMCIA_PCNET
> drivers/net/ethernet/amd/Kconfig-config PCMCIA_NMCLAN
> drivers/net/ethernet/fujitsu/Kconfig-config NET_VENDOR_FUJITSU
> drivers/net/ethernet/fujitsu/Kconfig-config PCMCIA_FMVJ18X
> drivers/net/ethernet/smsc/Kconfig-config PCMCIA_SMC91C92
> drivers/net/ethernet/xircom/Kconfig-config NET_VENDOR_XIRCOM
> drivers/net/ethernet/xircom/Kconfig-config PCMCIA_XIRC2PS
> drivers/parport/Kconfig-config PARPORT_PC_PCMCIA
> drivers/scsi/pcmcia/Kconfig-menuconfig SCSI_LOWLEVEL_PCMCIA
> drivers/ssb/Kconfig-config SSB_PCMCIAHOST_POSSIBLE
> drivers/tty/Kconfig-config IPWIRELESS
> drivers/tty/serial/8250/Kconfig-config SERIAL_8250_CS
> drivers/usb/host/Kconfig-config USB_SL811_CS
> sound/pcmcia/Kconfig-menuconfig SND_PCMCIA
>
>      Arnd



-- 
With best wishes
Dmitry