Re: [PATCH] [RFC] mtd/uclinux: support ROM and allow passing the base address

[Greg Ungerer <gerg@snapgear.com>]

Hi Uwe,

On 09/10/12 01:25, Uwe Kleine-König wrote:
> This allows to put the filesystem at a defined address in ROM allowing
> to save more precious RAM.
>
> I think it's save to default to ROM because the intention of using the
> uclinux map is to use a romfs and so mtd-ram doesn't give you anything
> that mtd-rom doesn't.
>
> Signed-off-by: Uwe Kleine-K÷nig <u.kleine-koenig@pengutronix.de>

Looks good to me, so:

Acked-by: Greg Ungerer <gerg@uclinux.org>

Couple of things to be aware of. Artem currently has a couple of
patches against this file (looks like at least 1 of them is currently
in linux-next). It will probably conflict with your changes, should
be easy enough to fix up.

The change to this file in linux-next changes the call to ioremap
to be a phys_to_virt - which is because it was always going to be
in real RAM. This may no longer be true with your change, it could
be in ROM. For non-MMU I expect no problems. But this could be an
issue if used on systems with MMU enabled. (And one of the other
changes that I generated for this allows this for at least one
architecture type - ColdFire/m68k). Just flagging this, I don't expect
it will cause any current users any problems.

Regards
Greg



> ---
>   drivers/mtd/maps/Kconfig   |    2 +-
>   drivers/mtd/maps/uclinux.c |   30 +++++++++++++++++++++++-------
>   2 files changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
> index 5ba2458..d945950 100644
> --- a/drivers/mtd/maps/Kconfig
> +++ b/drivers/mtd/maps/Kconfig
> @@ -443,7 +443,7 @@ config MTD_GPIO_ADDR
>
>   config MTD_UCLINUX
>   	bool "Generic uClinux RAM/ROM filesystem support"
> -	depends on MTD_RAM=y && !MMU
> +	depends on (MTD_RAM=y || MTD_ROM=y) && !MMU
>   	help
>   	  Map driver to support image based filesystems for uClinux.
>
> diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c
> index c3bb304..a8a5929 100644
> --- a/drivers/mtd/maps/uclinux.c
> +++ b/drivers/mtd/maps/uclinux.c
> @@ -23,12 +23,13 @@
>
>   /****************************************************************************/
>
> -struct map_info uclinux_ram_map = {
> -	.name = "RAM",
> -	.phys = (unsigned long)__bss_stop,
> +static struct map_info uclinux_ram_map = {
>   	.size = 0,
>   };
>
> +static unsigned long physaddr = -1;
> +module_param(physaddr, ulong, S_IRUGO);
> +
>   static struct mtd_info *uclinux_ram_mtdinfo;
>
>   /****************************************************************************/
> @@ -60,11 +61,17 @@ static int __init uclinux_mtd_init(void)
>   	struct map_info *mapp;
>
>   	mapp = &uclinux_ram_map;
> +
> +	if (physaddr == -1)
> +		mapp->phys = (resource_size_t)__bss_stop;
> +	else
> +		mapp->phys = physaddr;
> +
>   	if (!mapp->size)
>   		mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
>   	mapp->bankwidth = 4;
>
> -	printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
> +	printk("uclinux[mtd]: RAM/ROM probe address=0x%x size=0x%x\n",
>   	       	(int) mapp->phys, (int) mapp->size);
>
>   	mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
> @@ -76,9 +83,18 @@ static int __init uclinux_mtd_init(void)
>
>   	simple_map_init(mapp);
>
> -	mtd = do_map_probe("map_ram", mapp);
> +	mapp->name = "ROM";
> +	mtd = do_map_probe("map_rom", mapp);
> +	if (!mtd) {
> +		/* fall back to ram probing for compatibility reasons */
> +		mapp->name = "RAM";
> +		mtd = do_map_probe("map_ram", mapp);
> +		if (mtd && IS_ENABLED(CONFIG_MTD_ROM))
> +			pr_err("Failed to map rom, but ram succeeded. Please report this issue!\n");
> +	}
> +
>   	if (!mtd) {
> -		printk("uclinux[mtd]: failed to find a mapping?\n");
> +		printk("uclinux[mtd]: failed to find a rom/ram mapping?\n");
>   		iounmap(mapp->virt);
>   		return(-ENXIO);
>   	}
> @@ -115,6 +131,6 @@ module_exit(uclinux_mtd_cleanup);
>
>   MODULE_LICENSE("GPL");
>   MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
> -MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
> +MODULE_DESCRIPTION("Generic RAM/ROM based MTD for uClinux");
>
>   /****************************************************************************/
>


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