[PATCH] Boot XIP kernel for IMX

[David Woodhouse]

On Thu, 2008-02-28 at 09:24 +0200, Darius wrote:
> Adds possibility to boot XIP kernel from flash for IMX.
> I have tested it with M9328MXLADS V2.0 board.
> It does NOT support write to flash, it only does support booting xip 
> kernel. Somebody can continue and make feature to have rw rootfs in
> the 
> flash with XIP kernel together:)

Why doesn't write support work? If probes work, shouldn't writes?

This is an ARM architecture change and should probably go via rmk.

> diff -uprN -X linux-2.6.24.3-vanilla//Documentation/dontdiff linux-2.6.24.3-vanilla/arch/arm/Kconfig linux-2.6.24.3/arch/arm/Kconfig
> --- linux-2.6.24.3-vanilla/arch/arm/Kconfig	2008-01-25 00:58:37.000000000 +0200
> +++ linux-2.6.24.3/arch/arm/Kconfig	2008-02-27 14:51:50.000000000 +0200
> @@ -244,6 +244,7 @@ config ARCH_IMX
>  	select GENERIC_GPIO
>  	select GENERIC_TIME
>  	select GENERIC_CLOCKEVENTS
> +	select ARCH_MTD_XIP
>  	help
>  	  Support for Motorola's i.MX family of processors (MX1, MXL).
> diff -uprN -X linux-2.6.24.3-vanilla//Documentation/dontdiff linux-2.6.24.3-vanilla/include/asm-arm/arch-imx/imx-regs.h linux-2.6.24.3/include/asm-arm/arch-imx/imx-regs.h
> --- linux-2.6.24.3-vanilla/include/asm-arm/arch-imx/imx-regs.h	2008-01-25 00:58:37.000000000 +0200
> +++ linux-2.6.24.3/include/asm-arm/arch-imx/imx-regs.h	2008-02-13 17:58:42.000000000 +0200
> @@ -348,6 +348,10 @@
>  #define IMX_INTENABLEH     __REG(IMX_AITC_BASE+0x10)
>  #define IMX_INTENABLEL     __REG(IMX_AITC_BASE+0x14)
>  
> +#define IMX_NIPNDH	__REG(IMX_AITC_BASE+0x58) 		/* Normal Interrupt Pending Register High */
> +#define IMX_NIPNDL 	__REG(IMX_AITC_BASE+0x5C)		/* Normal Interrupt Pending Register Low  */
> +
> +
>  /*
>   *  General purpose timers
>   */
> diff -uprN -X linux-2.6.24.3-vanilla//Documentation/dontdiff linux-2.6.24.3-vanilla/include/asm-arm/arch-imx/mtd-xip.h linux-2.6.24.3/include/asm-arm/arch-imx/mtd-xip.h
> --- linux-2.6.24.3-vanilla/include/asm-arm/arch-imx/mtd-xip.h	1970-01-01 03:00:00.000000000 +0300
> +++ linux-2.6.24.3/include/asm-arm/arch-imx/mtd-xip.h	2008-02-27 15:00:22.000000000 +0200
> @@ -0,0 +1,37 @@
> +/*
> + * MTD primitives for XIP support. Architecture specific functions
> + *
> + * Do not include this file directly. It's included from linux/mtd/xip.h
> + * 
> + * Author:	
> + * Created:	Nov 2, 2004
> + * Copyright:	(C) 2004 MontaVista Software, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * $Id: xip.h,v 1.2 2004/12/01 15:49:10 nico Exp $
> + */
> +
> +#ifndef __ARCH_IMX_MTD_XIP_H__
> +#define __ARCH_IMX_MTD_XIP_H__
> +
> +#include <asm/arch/imx-regs.h>
> +
> +#define xip_irqpending()        (( IMX_INTENABLEH  & IMX_NIPNDH ) || ( IMX_INTENABLEL & IMX_NIPNDL ))
> +#define xip_currtime()          (IMX_TCN(1))
> +#define xip_elapsed_since(x)    (signed)((IMX_TCN(1) - (x)) / 4)
> +
> +/*
> +#define xip_irqpending()        ( IMX_NIPNDH || IMX_NIPNDL )
> +#define xip_currtime()          (IMX_TCN(IMX_TIM1_BASE))
> +#define xip_elapsed_since(x)    (signed)((IMX_TCN(IMX_TIM1_BASE) -(x)) * 31)
> +*/
> +
> +//#define xip_cpu_idle()  asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))
> +
> +#warning IMX_MTD_XIP enabled!
> +
> +#endif /* __ARCH_IMX_MTD_XIP_H__ */
> +
-- 
dwmw2