Zlib compress

David,

I can not use alignment trap with SamsungS3C4510 which is a ARM7TDMI processor, because ARM7TDMI does not have coprocessor 15 using in alignment trap codes. Now I try to use get_unaligned to fix the alignment problem in my platform and I can write the file into the flash, but when I read the file, I got decompressing error, then unalignment exception. How many codes do I need to modify?

inflate returned -5
Unhandled fault: alignment exception (13) at 0x00000001 fault-common.c 96

Internal error: Oops: 0
CPU: 0
pc : [<00028ad0>]    lr : [<00053c7c>]    Not tainted

sp : 002a5b3c ip : 001e7a88 fp : 002a5b54
r10: 003bd000 r9 : 00373000 r8 : 003bd000
r7 : 00373000 r6 : 00001000 r5 : 002a5bc8 r4 : 002399e8 r3 : 00000239 r2 : 00239a00 r1 : 00239a00 r0 : 00008e40
Flags: nzCv IRQs on FIQs on Mode SVC_32 Segment kernel
Control: 0
Process telnet (pid: 19, stackpage=002a5000)

Stack:
002a5b20:                            00053c7c  00028ad0 20000013

ffffffff 002399

Steve Tsai

I'm not aware of any related to JFFS2 or MTD other than the ones in the flash driver. Did you decode the oops you got? Where was it from?

--
dwmw2

I replace zlib.c and I can read the file now.
I only replace datum = *(__u16*)buf with datum = get_unaligned((__u16*)buf) in cfi_amdstd_write funtion. Is is enough? I read the discussion about alignment trap and mtd in armlinux mail list, and it seems that I should modify more codes.

Steve Tsai

I'm not aware of any related to JFFS2 or MTD other than the ones in the flash driver. Did you decode the oops you got? Where was it from?

--
dwmw2

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