Re: [PATCH 5/6] common: add mem_test routine

[Sascha Hauer <s.hauer@pengutronix.de>]

On Thu, Feb 07, 2013 at 11:44:59AM +0100, Alexander Aring wrote:
> Useful to detect timing problems if someone porting a new
> device to barebox.
> 
> This test includes a data bus test, address bus test and
> integrity check of memory.
> 
> Allocated barebox regions between start and end will skip
> automatically.
> 
> Signed-off-by: Alexander Aring <alex.aring@gmail.com>
> ---
>  common/Kconfig        |   7 +
>  common/Makefile       |   1 +
>  common/memory_test.c  | 399 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/memory_test.h |  13 ++
>  4 files changed, 420 insertions(+)
>  create mode 100644 common/memory_test.c
>  create mode 100644 include/memory_test.h
> 
> diff --git a/common/Kconfig b/common/Kconfig
> index 3f6c11e..c6988df 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -100,6 +100,13 @@ config MEMINFO
>  	bool "display memory info"
>  	default y
>  
> +config MEMTEST
> +	bool "Offers routines for memory test"
> +	help
> +	  Offers memtest routines in common/memory_test.c
> +	  This is helpful for porting devices to detect
> +	  memory timing problems.
> +
>  config ENVIRONMENT_VARIABLES
>  	bool "environment variables support"
>  
> diff --git a/common/Makefile b/common/Makefile
> index 7206eed..684953c 100644
> --- a/common/Makefile
> +++ b/common/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_MALLOC_DLMALLOC) += dlmalloc.o
>  obj-$(CONFIG_MALLOC_TLSF) += tlsf_malloc.o
>  obj-$(CONFIG_MALLOC_TLSF) += tlsf.o
>  obj-$(CONFIG_MALLOC_DUMMY) += dummy_malloc.o
> +obj-$(CONFIG_MEMTEST) += memory_test.o
>  obj-y += clock.o
>  obj-$(CONFIG_BANNER) += version.o
>  obj-$(CONFIG_MEMINFO) += meminfo.o
> diff --git a/common/memory_test.c b/common/memory_test.c
> new file mode 100644
> index 0000000..80b4ff4
> --- /dev/null
> +++ b/common/memory_test.c
> @@ -0,0 +1,399 @@
> +/*
> + * memory_test.c
> + *
> + * Copyright (c) 2013 Alexander Aring <aar@pengutronix.de>, Pengutronix
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * 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.
> + *
> + * 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.
> + *
> + */
> +
> +#include <memory_test.h>
> +
> +static const vu_long bitpattern[] = {
> +	0x00000001,	/* single bit */
> +	0x00000003,	/* two adjacent bits */
> +	0x00000007,	/* three adjacent bits */
> +	0x0000000F,	/* four adjacent bits */
> +	0x00000005,	/* two non-adjacent bits */
> +	0x00000015,	/* three non-adjacent bits */
> +	0x00000055,	/* four non-adjacent bits */
> +	0xAAAAAAAA,	/* alternating 1/0 */
> +};
> +
> +/*
> + * Perform a memory test. The complete test
> + * loops until interrupted by ctrl-c.
> + *
> + * Highly recommended to test with disabled and
> + * enabled cache.
> + *
> + * start: start address
> + * end: end address
> + * bus_only: skip integrity check
> + */
> +int mem_test(vu_long _start, vu_long _end,
> +		int bus_only)
> +{

I thought we agreed on using request_sdram_region here and drop the
address_in_sdram_regions in this function.

Sascha


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