Kernel changes for USB host

Oh, in case anyone wants to experiment with this, just add this to your machine file (arch/arm/mach-pxa/palmXX.c). I'm not going to post binaries or even a full patch now as this is still pretty experimental and you'll need to compile your own kernel with the drivers for whatever you want to connect anyway. Add the following headers, functions and a call in machine_init(). This should work on most of the PXA270 Palms.

#include <mach/pxa27x-udc.h>
#include <mach/ohci.h>

/*
 * USB Host (OHCI)
 */
static int palmt650_ohci_init(struct device *dev)
{
       UP2OCR = UP2OCR_HXS | UP2OCR_HXOE;
       UHCRHDA |= UHCRHDA_NOCP;
       UHCHR &= ~(UHCHR_SSEP2 | UHCHR_SSE);
       return 0;
}

static struct pxaohci_platform_data palmt650_ohci_platform_data = {
       .port_mode      = PMM_NPS_MODE,
       .init           = palmt650_ohci_init,
};

static void __init palmt650_init(void)
{
        ...
        pxa_set_ohci_info(&palmt650_ohci_platform_data);
}

You'll need to enable OHCI under USB host. I have been disabling USB gadget (client) support and I haven't tested what happens if you have both host and client enabled. I assume though that host probably takes precedence.

The easiest way to get a full speed device to enumerate is to plug the device in and use the "USB console" menu in Cocoboot before starting Linux. That'll turn on the USB pullups which will trick Linux into realizing there's a full speed device connected. You can also try turning on/off the pullups directly in Linux (GPIO 114 on the Treo 650). You can use gpio-val.c to control them within Linux (or a kernel module like GPIOed if you're using our older linux-hnd kernels).

Plus, someone was asking for a copy of the rootfs I use. For development work I just have an SD card with Debian/armel installed on it. This is not completely suitable for mobile devices but Debian has a ton of precompiled packages which you can just install with apt-get. This saves mucking around compiling. A few weeks ago I wrote some instructions in the forum including a tarball of a bare bones Debian image. I just install gcc, git-core and such on there and compile stuff on the device itself must of the time.