[PATCH 1/3] mxc: Add support for the imx51 3-stack board

[jason wang]

> Hi Jason,
> 
> On Tue, Jun 01, 2010 at 11:10:41PM +0800, Jason Wang wrote:
>> 3-stack is a reference board from Freescale for their i.MX51 SoC.
>> 
>> Add board definition, Kconfig and Makefile to enable Freescale 3-stack
>> board.
> 
> The debug board code looks the same like in mach-mx31_3ds.c. Does
> anybody know how similar the different debug boards for the 3ds boards
> are? ATM we only have the mx31_3ds with debug board support in the
> kernel. This could be the moment to go for a arch/arm/plat-mxc/3ds-debugboard.c
> 
Besides mx31_3ds and mx51_3ds, the mx31_ads and mx27_ads also have the similar CPLD expanding device.
They have similar functions but different CPLD image version. That is to say, except base_addr and parent_irq_pin,
the CPLD implemented device controller(like uart and interrupt controller) will be a little bit different.
I think the software for this part could be moved to a common file like plat-mxc/mxc-debugboard.c

Because this is a big action, it will affect some exsiting platforms. How about leave this work to next
action?

Thanks,
Jason.
> Several other comments inline.
> 
Except following 1 comment, all others will be addressed in V2.

<snip>
>> 
>> Boot tested on a i.MX51 3-stack Rev2.0 board
>> + __raw_writew(0xFFFF, brd_io + INTR_RESET_REG);
>> + __raw_writew(0, brd_io + INTR_RESET_REG);
>> + __raw_writew(0x1F, brd_io + INTR_MASK_REG);
>> + for (i = MXC_BOARD_IRQ_START;
>> +      i < (MXC_BOARD_IRQ_START + MXC_BOARD_IRQS); i++) {
> 
> MXC_BOARD_IRQS is the maximum number of interrupts available for the
> board. What you need here instead is the number of interrupts the expio
> actually has.
> 
It seems MXC_BOARD_IRQS is the number of CPLD expanding irq(or debugboard expanding irq).

Thanks,
Jason.
<snip>