Re: fail to boot with MTD root fs

["Steven J. Hill" <sjhill@realitydiluted.com>]

Kunihiko IMAI wrote:
> Hi,
> 
> I'm using Pb1500 evaluation board and met somewhat serious problem.
> The problem is that failing to mount FlashROM filesystem as root fs
> and go into infinite loop without any message.  Does anyone have a
> good (or better) solution?
> 
> I'm using SGI kernel source tree, linux-2.4.18 of linux_2_4 branch.
> 
> When booting with nfs root, and using MTD FlashROM fs, it works well.
> 
There was a bug in 2.4.18 with respect to the MTD code and using flash
as a root filesystem. It had to do with the MTD block devices. Make
the changes below and things will work again.

-Steve

Index: mtdblock.c
===================================================================
RCS file: /data/cvs/settop/drivers/mtd/mtdblock.c,v
retrieving revision 1.6
diff -u -r1.6 mtdblock.c
--- mtdblock.c  9 May 2002 13:35:40 -0000       1.6
+++ mtdblock.c  25 May 2002 16:52:14 -0000
@@ -371,8 +371,6 @@
         if (inode == NULL)
                 release_return(-ENODEV);

-       invalidate_device(inode->i_rdev, 1);
-
         dev = MINOR(inode->i_rdev);
         mtdblk = mtdblks[dev];

Index: mtdblock_ro.c
===================================================================
RCS file: /data/cvs/settop/drivers/mtd/mtdblock_ro.c,v
retrieving revision 1.2
diff -u -r1.2 mtdblock_ro.c
--- mtdblock_ro.c       3 Jan 2002 17:19:58 -0000       1.2
+++ mtdblock_ro.c       25 May 2002 16:53:01 -0000
@@ -79,8 +79,6 @@
         if (inode == NULL)
                 release_return(-ENODEV);

-       invalidate_device(inode->i_rdev, 1);
-
         dev = MINOR(inode->i_rdev);
         mtd = __get_mtd_device(NULL, dev);