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authorDan Brown <dan_brown@ieee.org>2005-03-29 21:57:48 +0100
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-05-23 13:04:36 +0200
commit1a78ff6b4114cfb0f734b7df217759315d692683 (patch)
tree279791ef920eeef1ba87f0305b722cd5fa4c5a14 /drivers
parent15fc108606a499df44549274a95d1e3455823347 (diff)
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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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mtd/nand/diskonchip.c50
1 files changed, 28 insertions, 22 deletions
diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index a9b1da40ad3..a96c43b4ea1 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -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;
+ if (show_firmware_partition == 1) {
+ parts[0].name = " DiskOnChip Firmware / Media Header partition";
+ parts[0].offset = 0;
+ parts[0].size = offs;
+ numparts = 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++;
- 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;
+ parts[numparts].name = " DiskOnChip Remainder partition";
+ parts[numparts].offset = offs;
+ parts[numparts].size = mtd->size - offs;
+ numparts++;
}
- ret = 1;
+
+ 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";