Dear uClinux,
I have a Hardware similar to the coyote (ARM IXP4XX) platform with an extra
16c550 UART.
The UART CS is connected to CS2 of the expansion bus. I have made the following
modifcations
in the file linux-2.6.25.15/arch/arm/mach-ixp4xx/coyote-setup.c
...
#define IXP4XX_EXTRA_UART_BASE (IXP4XX_EXP_BUS_BASE_PHYS+0x2000000)
static struct resource extra_uart_resource = {
.start = IXP4XX_EXTRA_UART_BASE,
.end = IXP4XX_EXTRA_UART_BASE+0x0fff,
.flags = IORESOURCE_MEM,
};
static struct plat_serial8250_port extra_uart_data[] = {
{
.mapbase = IXP4XX_EXTRA_UART_BASE,
.membase = IXP4XX_EXTRA_UART_BASE, // ????? unsure about the virtual
addr
.irq = IRQ_IXP4XX_GPIO5,
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
.iotype = UPIO_MEM,
.uartclk = IXP4XX_UART_XTAL,
},
{ },
};
....
static struct platform_device extra_uart = {
.name = "serialextra8250",
.id = PLAT8250_DEV_PLATFORM1,
.dev = {
.platform_data = extra_uart_data,
},
.num_resources = 1,
.resource = &extra_uart_resource,
};
....
I can compile my code but the UART is not detected.
---boot---
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0xc8000000 (irq = 15) is a XScale
console [ttyS0] enabled
console [netcon0] enabled
----
I see the region is registered but thats all.
[EMAIL PROTECTED]:/# cat /proc/iomem
00000000-03ffffff : System RAM
003d3000-005defff : Kernel text
005e0000-0060a66f : Kernel data
50000000-51ffffff : IXP4XX-Flash.0
50000000-51ffffff : IXP4XXFlash
52000000-52000fff : serialextra8250.1
c8000000-c800001f : serial
c8001000-c8001fff : serial8250.0
c800b000-c800bfff : pxa2xx-udc
Can anyone point me in the right direction, please. Is the way I use ok?
Is there any example or doc available?
Thank you in Andvance
Wolf
PS: The CS2 signal is activated in U-Boot and I can see with a small test
function the UART is present, but only in U-Boot.
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