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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>
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parent
a2f74a7dac
commit
81f53ff89c
2 changed files with 20 additions and 6 deletions
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@ -429,7 +429,7 @@ config MTD_GPIO_ADDR
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config MTD_UCLINUX
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bool "Generic uClinux RAM/ROM filesystem support"
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depends on MTD_RAM=y && (!MMU || COLDFIRE)
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depends on (MTD_RAM=y || MTD_ROM=y) && (!MMU || COLDFIRE)
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help
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Map driver to support image based filesystems for uClinux.
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@ -23,12 +23,20 @@
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/****************************************************************************/
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#ifdef CONFIG_MTD_ROM
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#define MAP_NAME "rom"
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#else
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#define MAP_NAME "ram"
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#endif
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struct map_info uclinux_ram_map = {
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.name = "RAM",
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.phys = (unsigned long)__bss_stop,
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.name = MAP_NAME,
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.size = 0,
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};
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static unsigned long physaddr = -1;
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module_param(physaddr, ulong, S_IRUGO);
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static struct mtd_info *uclinux_ram_mtdinfo;
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/****************************************************************************/
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@ -60,11 +68,17 @@ static int __init uclinux_mtd_init(void)
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struct map_info *mapp;
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mapp = &uclinux_ram_map;
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if (physaddr == -1)
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mapp->phys = (resource_size_t)__bss_stop;
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else
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mapp->phys = physaddr;
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if (!mapp->size)
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mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
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mapp->bankwidth = 4;
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printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
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printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
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(int) mapp->phys, (int) mapp->size);
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/*
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@ -82,7 +96,7 @@ static int __init uclinux_mtd_init(void)
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simple_map_init(mapp);
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mtd = do_map_probe("map_ram", mapp);
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mtd = do_map_probe("map_" MAP_NAME, mapp);
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if (!mtd) {
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printk("uclinux[mtd]: failed to find a mapping?\n");
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return(-ENXIO);
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@ -118,6 +132,6 @@ module_exit(uclinux_mtd_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
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MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
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MODULE_DESCRIPTION("Generic MTD for uClinux");
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/****************************************************************************/
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