[U-Boot] [PATCH v2] mx27ads: add support for iMX27ADS board from Freescale

Magnus Lilja lilja.magnus at gmail.com
Tue Sep 15 21:42:52 CEST 2009 

Hi

Some minor below.

Alan Carvalho de Assis skrev:
> This patch adds support to iMX27ADS development board. This board has
> 128MB RAM, 32MB NOR Flash and 128MB NAND Flash. Currently only
> booting from NOR is supported.
> 
> Signed-off-by: Alan Carvalho de Assis <acassis at gmail.com>
> ---
>  MAINTAINERS                             |    3 +
>  MAKEALL                                 |    1 +
>  Makefile                                |    3 +
>  board/freescale/mx27ads/Makefile        |   51 ++++++++
>  board/freescale/mx27ads/config.mk       |    1 +
>  board/freescale/mx27ads/lowlevel_init.S |  128 +++++++++++++++++++
>  board/freescale/mx27ads/mx27ads.c       |   93 ++++++++++++++
>  board/freescale/mx27ads/u-boot.lds      |   56 +++++++++
>  include/configs/mx27ads.h               |  202 +++++++++++++++++++++++++++++++
>  9 files changed, 538 insertions(+), 0 deletions(-)
>  create mode 100644 board/freescale/mx27ads/Makefile
>  create mode 100644 board/freescale/mx27ads/config.mk
>  create mode 100644 board/freescale/mx27ads/lowlevel_init.S
>  create mode 100644 board/freescale/mx27ads/mx27ads.c
>  create mode 100644 board/freescale/mx27ads/u-boot.lds
>  create mode 100644 include/configs/mx27ads.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e9db278..5b25188 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -550,6 +550,9 @@ Thomas Elste <info at elste.org>
> 
>  	modnet50	ARM720T (NET+50)
> 
> +Alan Carvalho de Assis <acassis at gmail.com>
> +	mx27ads		i.MX27
> +

The list shall be kept sorted by maintainer name. So the mx27ads shall be moved.

>  Fabio Estevam <Fabio.Estevam at freescale.com>
> 
>  	mx31pdk		i.MX31
> diff --git a/MAKEALL b/MAKEALL
> index f0ed8ea..8411eef 100755
> --- a/MAKEALL
> +++ b/MAKEALL
> @@ -520,6 +520,7 @@ LIST_ARM9="			\
>  	cp926ejs		\
>  	cp946es			\
>  	cp966			\
> +	mx27ads			\

The list is sorted alphabetically so move this down a bit.

>  	imx27lite		\
>  	lpd7a400		\
>  	mv88f6281gtw_ge		\
> diff --git a/Makefile b/Makefile
> index 0449a5b..6fa4b28 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -2961,6 +2961,9 @@ davinci_dm365evm_config :	unconfig
>  imx27lite_config:	unconfig
>  	@$(MKCONFIG) $(@:_config=) arm arm926ejs imx27lite logicpd mx27
> 
> +mx27ads_config :	unconfig
> +	@$(MKCONFIG) $(@:_config=) arm arm926ejs mx27ads freescale mx27
> +
>  lpd7a400_config \
>  lpd7a404_config:	unconfig
>  	@$(MKCONFIG) $(@:_config=) arm lh7a40x lpd7a40x

> diff --git a/board/freescale/mx27ads/lowlevel_init.S
> b/board/freescale/mx27ads/lowlevel_init.S
> new file mode 100644
> index 0000000..a4e1191
> --- /dev/null
> +++ b/board/freescale/mx27ads/lowlevel_init.S
> @@ -0,0 +1,128 @@
> +/*
> + * Copyright (C) 2008, Guennadi Liakhovetski <lg at denx.de>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + */
> +
> +/*
> + * For clock initialization, see chapter 3 of the "MCIMX27 Multimedia
> + * Applications Processor Reference Manual, Rev. 0.2".
> + *
> + */
> +
> +#include <config.h>
> +#include <asm/macro.h>
> +#include <asm/arch/imx-regs.h>
> +#include <asm/arch/asm-offsets.h>
> +
> +.macro sdram_init
> +	/*
> +	 * DDR on CSD0
> +	 */
> +	write32 0xD8001010 0x00000008

I would insert a comma (,) after the first argument to the macro. Didn't know it worked without.
The same comment applies to the rest of this file. Don't know what the U-boot coding standard says about this though.

> +	write32 0x10027828 0x55555555
> +	write32 0x10027830 0x55555555
> +	write32 0x10027834 0x55555555
> +	write32 0x10027838 0x00005005
> +	write32 0x1002783C 0x15555555
> +	write32 0xD8001010 0x00000004
> +	write32 0xD8001004 0x006ac73a
> +	write32 0xD8001000 0x92100000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xD8001000 0xA2100000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xD8001000 0xA2200000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xA0000F00 0x00000000
> +	write32 0xD8001000 0xb2100000
> +	ldr		r0, =0xA0000033
> +	mov		r1, #0xda
> +	strb		r1, [r0]
> +	ldr		r0, =0xA1000000
> +	mov		r1, #0xff
> +	strb		r1, [r0]
> +	write32 0xD8001000 0x82226080
> +.endm
> +
> +.globl lowlevel_init
> +lowlevel_init:
> +
> +	mov	r10, lr
> +
> +	/* ahb lite ip interface */
> +	write32 AIPI1_PSR0 0x20040304
> +	write32 AIPI1_PSR1 0xDFFBFCFB
> +	write32 AIPI2_PSR0 0x00000000
> +	write32 AIPI2_PSR1 0xFFFFFFFF
> +
> +	/* disable mpll/spll */
> +	ldr r0, =CSCR
> +	ldr r1, [r0]
> +	bic r1, r1, #0x03
> +	str r1, [r0]
> +
> +	/*
> +	 * pll clock initialization - see section 3.4.3 of the i.MX27 manual
> +	 *
> +	 * FIXME: Using the 399*2 MHz values from table 3-8 doens't work
> +	 *        with 1.2 V core voltage! Find out if this is
> +	 *        documented somewhere.
> +	 */
> +	write32 MPCTL0 0x1EF15D5	/* MPLL = 199.5*2 MHz               */
> +	write32 SPCTL0 0x043A1C09	/* SPLL = FIXME (needs review)      */
> +
> +	/*
> +	 * ARM clock = (399 MHz / 2) / (ARM divider = 1) = 200 MHz
> +	 * AHB clock = (399 MHz / 3) / (AHB divider = 2) = 66.5 MHz
> +	 * System clock (HCLK) = 133 MHz
> +	 */
> +	write32 CSCR, (0x33F08107 | CSCR_MPLL_RESTART | CSCR_SPLL_RESTART)
> +
> +	/* add some delay here */
> +	mov r1, #0x1000
> +1:	subs r1, r1, #0x1
> +	bne 1b
> +
> +	/* clock gating enable */
> +	write32 0x10027818 0x00050f08
> +
> +	/* peripheral clock divider */
> +	write32 PCDR0 0x120470C3	/* FIXME                            */
> +	write32 PCDR1 0x03030303	/* PERDIV1=08 @133 MHz              */
> +					/* PERDIV1=04 @266 MHz              *
> +					 * /

The last line with '* /' looks a bit odd compated to the other comments.

> +
> +	/* Configure PCCR0 and PCCR1*/
> +	write32 PCCR0 0xFFFFFFFF
> +	write32 PCCR1 0xFFFFFFFC
> +
> +	/* skip sdram initialization if we run from ram */
> +	cmp	pc, #0xa0000000
> +	bls	1f
> +	cmp	pc, #0xc0000000
> +	bhi	1f
> +
> +	mov	pc,r10
> +1:
> +	sdram_init
> +
> +	mov	pc,r10
> +

> diff --git a/include/configs/mx27ads.h b/include/configs/mx27ads.h
> new file mode 100644
> index 0000000..3360d76
> --- /dev/null
> +++ b/include/configs/mx27ads.h
<...>
> +/*
> + * Ethernet
> + */
> +#define CONFIG_FEC_MXC
> +#define CONFIG_FEC_MXC_PHYADDR	0x1f
> +#define CONFIG_MII
> +#define CONFIG_NET_MULTI
> +
> +/*#define CONFIG_DRIVER_CS8900    1
> +#define CS8900_BASE             0xD4020300
> +#define CS8900_BUS16            1*/

Does the board have a CS8900 as well?


Regards, Magnus

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