From: Christopher Cordahi Date: Tue, 18 Dec 2012 21:11:51 +0000 (-0500) Subject: mtd: cmdlinepart: describe mtd ordering X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=ea8b8e27fecd44c4fb7b3c6f8f72ea7b92f87fe8;p=deliverable%2Flinux.git mtd: cmdlinepart: describe mtd ordering The mtd documentation makes no mention of the useful feature whereby partitions' logical ordering need not match their physical ordering. Truncation of parts, skipping of zero sized parts, and handling of overlapping parts are similarly not mentioned. This updates the comments at the top of file describing the command line parsing as currently implemented. I proposed this in http://lists.infradead.org/pipermail/linux-mtd/2012-December/045314.html Signed-off-by: Christopher Cordahi Signed-off-by: Artem Bityutskiy --- diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c index 525c5795d4f5..8d4a16661649 100644 --- a/drivers/mtd/cmdlinepart.c +++ b/drivers/mtd/cmdlinepart.c @@ -23,11 +23,22 @@ * mtdparts=[; := :[,] * where is the name from the "cat /proc/mtd" command - * := [@offset][][ro][lk] + * := [@][][ro][lk] * := unique name used in mapping driver/device (mtd->name) * := standard linux memsize OR "-" to denote all remaining space + * size is automatically truncated at end of device + * if specified or trucated size is 0 the part is skipped + * := standard linux memsize + * if omitted the part will immediately follow the previous part + * or 0 if the first part * := '(' NAME ')' * + * and can be specified such that the parts are out of order + * in physical memory and may even overlap. + * + * The parts are assigned MTD numbers in the order they are specified in the + * command line regardless of their order in physical memory. + * * Examples: * * 1 NOR Flash, with 1 single writable partition: