diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2013-01-16 15:36:55 +0100 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2013-02-04 08:26:30 +0100 |
| commit | 81f53ff89c136b72fc35a91d676aca2bc332bd33 (patch) | |
| tree | 7e97e966560c5dfb0bf181872cc7969e1e8e2259 /drivers/mtd | |
| parent | mtd: bcm47xxsflash: add own struct for abstrating bus type (diff) | |
| download | linux-81f53ff89c136b72fc35a91d676aca2bc332bd33.tar.xz linux-81f53ff89c136b72fc35a91d676aca2bc332bd33.zip | |
mtd: uclinux: support ROM and allow passing the base address
This allows to put the filesystem at a defined address in ROM allowing
to save more precious RAM.
I think it's safe 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-König <u.kleine-koenig@pengutronix.de>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/maps/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/mtd/maps/uclinux.c | 24 |
2 files changed, 20 insertions, 6 deletions
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig index 62ba82c396c2..3ed17c4d4358 100644 --- a/drivers/mtd/maps/Kconfig +++ b/drivers/mtd/maps/Kconfig @@ -429,7 +429,7 @@ config MTD_GPIO_ADDR config MTD_UCLINUX bool "Generic uClinux RAM/ROM filesystem support" - depends on MTD_RAM=y && (!MMU || COLDFIRE) + depends on (MTD_RAM=y || MTD_ROM=y) && (!MMU || COLDFIRE) 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 299bf88a6f41..f56d0aa4404b 100644 --- a/drivers/mtd/maps/uclinux.c +++ b/drivers/mtd/maps/uclinux.c @@ -23,12 +23,20 @@ /****************************************************************************/ +#ifdef CONFIG_MTD_ROM +#define MAP_NAME "rom" +#else +#define MAP_NAME "ram" +#endif + struct map_info uclinux_ram_map = { - .name = "RAM", - .phys = (unsigned long)__bss_stop, + .name = MAP_NAME, .size = 0, }; +static unsigned long physaddr = -1; +module_param(physaddr, ulong, S_IRUGO); + static struct mtd_info *uclinux_ram_mtdinfo; /****************************************************************************/ @@ -60,11 +68,17 @@ 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]: probe address=0x%x size=0x%x\n", (int) mapp->phys, (int) mapp->size); /* @@ -82,7 +96,7 @@ static int __init uclinux_mtd_init(void) simple_map_init(mapp); - mtd = do_map_probe("map_ram", mapp); + mtd = do_map_probe("map_" MAP_NAME, mapp); if (!mtd) { printk("uclinux[mtd]: failed to find a mapping?\n"); return(-ENXIO); @@ -118,6 +132,6 @@ 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 MTD for uClinux"); /****************************************************************************/ |