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[MTD] DiskOnChip: Scan the entire device for Media Headers. 

Add a new module param, show_firmware_partition.

Signed-off-by: Dan Brown <dan_brown@ieee.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Dan Brown 2005-03-29 21:57:48 +01:00 committed by Thomas Gleixner
parent 15fc108606
commit 1a78ff6b41
1 changed files with 30 additions and 24 deletions
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54
drivers/mtd/nand/diskonchip.c
View File

@ -16,7 +16,7 @@
*
* Interface to generic NAND code for M-Systems DiskOnChip devices
*
* $Id: diskonchip.c,v 1.49 2005/02/22 21:48:21 gleixner Exp $
* $Id: diskonchip.c,v 1.50 2005/03/29 20:57:45 dbrown Exp $
*/
#include <linux/kernel.h>
@ -81,11 +81,6 @@ struct doc_priv {
struct mtd_info *nextdoc;
};
/* Max number of eraseblocks to scan (from start of device) for the (I)NFTL
MediaHeader. The spec says to just keep going, I think, but that's just
silly. */
#define MAX_MEDIAHEADER_SCAN 8
/* This is the syndrome computed by the HW ecc generator upon reading an empty
page, one with all 0xff for data and stored ecc code. */
static u_char empty_read_syndrome[6] = { 0x26, 0xff, 0x6d, 0x47, 0x73, 0x7a };
@ -114,6 +109,9 @@ module_param(no_ecc_failures, int, 0);
#ifdef CONFIG_MTD_PARTITIONS
static int no_autopart=0;
module_param(no_autopart, int, 0);
static int show_firmware_partition=0;
module_param(show_firmware_partition, int, 0);
#endif
#ifdef MTD_NAND_DISKONCHIP_BBTWRITE
@ -1071,12 +1069,11 @@ static int __init find_media_headers(struct mtd_info *mtd, u_char *buf,
{
struct nand_chip *this = mtd->priv;
struct doc_priv *doc = this->priv;
unsigned offs, end = (MAX_MEDIAHEADER_SCAN << this->phys_erase_shift);
unsigned offs;
int ret;
size_t retlen;
end = min(end, mtd->size); // paranoia
for (offs = 0; offs < end; offs += mtd->erasesize) {
for (offs = 0; offs < mtd->size; offs += mtd->erasesize) {
ret = mtd->read(mtd, offs, mtd->oobblock, &retlen, buf);
if (retlen != mtd->oobblock) continue;
if (ret) {
@ -1118,6 +1115,7 @@ static inline int __init nftl_partscan(struct mtd_info *mtd,
u_char *buf;
struct NFTLMediaHeader *mh;
const unsigned psize = 1 << this->page_shift;
int numparts = 0;
unsigned blocks, maxblocks;
int offs, numheaders;
@ -1183,19 +1181,28 @@ static inline int __init nftl_partscan(struct mtd_info *mtd,
offs <<= this->page_shift;
offs += mtd->erasesize;
parts[0].name = " DiskOnChip BDTL partition";
parts[0].offset = offs;
parts[0].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;
offs += parts[0].size;
if (offs < mtd->size) {
parts[1].name = " DiskOnChip Remainder partition";
parts[1].offset = offs;
parts[1].size = mtd->size - offs;
ret = 2;
goto out;
if (show_firmware_partition == 1) {
parts[0].name = " DiskOnChip Firmware / Media Header partition";
parts[0].offset = 0;
parts[0].size = offs;
numparts = 1;
}
ret = 1;
parts[numparts].name = " DiskOnChip BDTL partition";
parts[numparts].offset = offs;
parts[numparts].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;
offs += parts[numparts].size;
numparts++;
if (offs < mtd->size) {
parts[numparts].name = " DiskOnChip Remainder partition";
parts[numparts].offset = offs;
parts[numparts].size = mtd->size - offs;
numparts++;
}
ret = numparts;
out:
kfree(buf);
return ret;
@ -1289,14 +1296,13 @@ static inline int __init inftl_partscan(struct mtd_info *mtd,
ip->lastUnit, ip->flags,
ip->spareUnits);
#if 0
if ((i == 0) && (ip->firstUnit > 0)) {
if ((show_firmware_partition == 1) &&
(i == 0) && (ip->firstUnit > 0)) {
parts[0].name = " DiskOnChip IPL / Media Header partition";
parts[0].offset = 0;
parts[0].size = mtd->erasesize * ip->firstUnit;
numparts = 1;
}
#endif
if (ip->flags & INFTL_BINARY)
parts[numparts].name = " DiskOnChip BDK partition";