[U-Boot] nand: current mainline show "new" startup output

[Heiko Schocher]

Hello Christian, Scott,

current mainline code of U-Boot:

commit 9a3aae22edf1eda6326cc51c28631ca5c23b7706
Author: Christian Riesch <christian.riesch at omicron.at>
Date:   Thu Feb 2 00:44:42 2012 +0000

    arm, davinci: Add support for the Calimain board from OMICRON electronics

    This patch adds support for the Calimain board from
    OMICRON electronics GmbH. The board features a Texas Instruments AM1808
    SoC, 128 MB DDR2 memory, and 64 MB NOR flash memory connected to CS2 and
    CS3.

    Signed-off-by: Christian Riesch <christian.riesch at omicron.at>

shows now on startup the following printfs on the enbw_cmc board:



U-Boot 2011.12-00331-ga400f85 (Feb 13 2012 - 08:49:17)

I2C:   ready
[...]
NAND:  Bad block table found at page 65472, version 0x01
Bad block table found at page 65408, version 0x01
nand_read_bbt: Bad block at 0x000002980000
nand_read_bbt: Bad block at 0x000003240000
128 MiB
MMC:   davinci: 0

Found with "git bisect" the reason:

[hs at pollux u-boot]$ git bisect good
2a8e0fc8b3dc31a3c571e439fbf04b882c8986be is the first bad commit
commit 2a8e0fc8b3dc31a3c571e439fbf04b882c8986be
Author: Christian Hitz <christian.hitz at aizo.com>
Date:   Wed Oct 12 09:32:02 2011 +0200

    nand: Merge changes from Linux nand driver

    [backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe]

    This patch synchronizes the nand driver with the Linux 3.0 state.

    Signed-off-by: Christian Hitz <christian.hitz at aizo.com>
    Cc: Scott Wood <scottwood at freescale.com>
    [scottwood at freescale.com: minor fixes]
    Signed-off-by: Scott Wood <scottwood at freescale.com>

:040000 040000 5ab34f43b64379528b9ef2652c8481fdab1a927a b453a49035e179dfb5f31c3164a1b7d3d62d66d6 M      drivers
:040000 040000 b59a7f3136da038b4b49c48cd0958e140a09ed66 a8fd298715a562fda0a350e6f732c1072ca7d410 M      include
[hs at pollux u-boot]$

Looking in this patch, it seems to me, this is the "reason":

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 758b53f..ed2640c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
[...]
@@ -2992,9 +3145,10 @@ int nand_scan_tail(struct mtd_info *mtd)

        /* Check, if we should skip the bad block table scan */
        if (chip->options & NAND_SKIP_BBTSCAN)
-               chip->options |= NAND_BBT_SCANNED;
+               return 0;

-       return 0;
+       /* Build bad block table */
+       return chip->scan_bbt(mtd);
 }

 /**

... This printfs in the startoutput are suboptimal ... maybe we apply
the following patch:

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 2b730e0..bf12df8 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -259,10 +259,10 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
                                        mtd->ecc_stats.bbtblocks++;
                                        continue;
                                }
-                               /* Leave it for now, if its matured we can move this
-                                * message to MTD_DEBUG_LEVEL0 */
-                               printk(KERN_DEBUG "nand_read_bbt: Bad block at 0x%012llx\n",
-                                      (loff_t)((offs << 2) + (act >> 1)) << this->bbt_erase_shift);
+                               MTDDEBUG(MTD_DEBUG_LEVEL0, "nand_read_bbt: " \
+                                       "Bad block at 0x%012llx\n",
+                                       (loff_t)((offs << 2) + (act >> 1))
+                                       << this->bbt_erase_shift);
                                /* Factory marked bad or worn out ? */
                                if (tmp == 0)
                                        this->bbt[offs + (act >> 3)] |= 0x3 << (act & 0x06);
@@ -651,8 +651,9 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
                if (td->pages[i] == -1)
                        printk(KERN_WARNING "Bad block table not found for chip %d\n", i);
                else
-                       printk(KERN_DEBUG "Bad block table found at page %d, version 0x%02X\n", td->pages[i],
-                              td->version[i]);
+                       MTDDEBUG(MTD_DEBUG_LEVEL0, "Bad block table found " \
+                               "at page %d, version 0x%02X\n", td->pages[i],
+                               td->version[i]);
        }
        return 0;
 }

If this patch is OK, I can send it ...

bye,
Heiko
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