RE: Using Linux 2.6.19 with Xilinx ML405

["Leonid" <Leonid@a-k-a.net>]

Take a look in 2.6.20 kernel - it's said to be supporting uartlite - u =
can port it back to 2.6.19.

-----Original Message-----
From: "Peter Korsgaard" <jacmet@sunsite.dk>
To: "linuxppc-embedded@ozlabs.org" <linuxppc-embedded@ozlabs.org>
Sent: 4/4/07 6:33 AM
Subject: Re: Using Linux 2.6.19 with Xilinx ML405

>>>>> "PM" =3D=3D Peter Mendham <petermendham@computing.dundee.ac.uk> =
writes:

Hi,

PM> Brilliant!  Thanks.  The code your patch produces expects there to
PM> be an 8250 compatible UART around.  What happens if I only have a
PM> UARTlite?  What do I need to fill in to a platform_device
PM> structure for a UARTlite?

Something like:

static struct resource myboarduartlite_resources[] =3D {
	[0] =3D {
		.start  =3D 0xa1000003,
		.end    =3D 0xa1000012,
		.flags  =3D IORESOURCE_MEM,
	},
	[1] =3D {
		.start	=3D 2,
		.end	=3D 2,
		.flags	=3D IORESOURCE_IRQ,
	},
};

static struct platform_device myboard_uartlite =3D {
	.name			=3D "uartlite",
	.id			=3D 0,
	.num_resources		=3D ARRAY_SIZE(myboarduartlite_resources),
	.resource		=3D myboarduartlite_resources,
};

static struct platform_device *myboard_devices[] __initdata =3D {
	..
	&myboard_uartlite,
        ..
};

static int __init
myboard_platform_add_devices(void)
{
	return platform_add_devices(myboard_devices,
                ARRAY_SIZE(myboard_devices));

}
arch_initcall(myboard_platform_add_devices);

Notice the +3 for the base address as the registers are accessed using
8bit I/O.

PM> I have just moved to 2.6.20 kernel in the hope of using the
PM> mainline uartlite driver - was this a stupid thing to do?

Not if you ask me ;)

PM> Do you know if I can use it for early serial in the same way as an
PM> 8250?

Unfortunately not. I started working on some patches for this some
months ago, but got stalled doing other stuff. I doubt it will get
integrated before the move to arch/powerpc.

--=20
Bye, Peter Korsgaard
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