New: MTD startup lock when using multiple nor flash chips

Bugme-new Andrew Morton 1 participant 1 message Jan 27, 2008 1 message not in the archive Memory technology devices (MTD)

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Andrew Morton

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2008-01-27 10:06 UTC #1 lore raw

Quoted 18 lines · On Sat, 26 Jan 2008 23:33:25 -0800 (PST) [email protected] wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=9829

           Summary: MTD startup lock when using multiple nor flash chips
           Product: IO/Storage
           Version: 2.5
     KernelVersion: 2.6.24
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Other
        AssignedTo: [email protected]
        ReportedBy: [email protected]

Quoted 14 lines

Latest working kernel version: 2.6.17 (not sure)
Earliest failing kernel version: 2.6.18 (not sure)
Distribution: kernel only in embedded system
Hardware Environment: arm9 booting from 2 contiguous flash nor chip (4MB+4MB) Software Environment: kernel startup
Problem Description: startup locks. I found and solved the problem, at line 115 of drivers/mtd/chips/gen_probe.c (kernel 2.6.24): mapsize value must be calculated in bytes, not in long.
I replaced line 115 from:
mapsize = (max_chips + BITS_PER_LONG-1) / BITS_PER_LONG;
to:
mapsize = sizeof(long) * ( (max_chips + BITS_PER_LONG-1) / BITS_PER_LONG ); And all worked OK
Steps to reproduce: boot up the kernel

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