diff options
| author | Wolfgang Denk <wd@denx.de> | 2010-06-21 22:29:59 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-06-23 02:09:20 +0200 |
| commit | 460c2ce362e56890c2a029e2c3b1ff2796c7fc54 (patch) | |
| tree | 625be474d895469685f41febbe93f278542076f3 /arch/powerpc/lib | |
| parent | 47ea6edfb3004fb2d2a979e19c3f6e4e32f45e51 (diff) | |
MPC5200: workaround data corruption for unaligned local bus accesses
The MPC5200 has a nasty problem that will cause silent data corruption
when performing unaligned 16 or 32 byte accesses when reading from the
local bus - typically this affects reading from flash. The problem can
be easily shown:
=> md fc0c0000 10
fc0c0000: 323e4337 01626f6f 74636d64 3d72756e 2>C7.bootcmd=run
fc0c0010: 206e6574 5f6e6673 00626f6f 7464656c net_nfs.bootdel
fc0c0020: 61793d35 00626175 64726174 653d3131 ay=5.baudrate=11
fc0c0030: 35323030 00707265 626f6f74 3d656368 5200.preboot=ech
=> md fc0c0001 10
fc0c0001: 65636801 00000074 0000003d 00000020 ech....t...=...
fc0c0011: 0000005f 00000000 00000074 00000061 ..._.......t...a
fc0c0021: 00000000 00000064 00000065 00000035 .......d...e...5
fc0c0031: 00000000 00000062 0000003d 0000006f .......b...=...o
=> md.w fc0c0001 10
fc0c0001: 0000 3701 0000 6f74 0000 643d 0000 6e20 ..7...ot..d=..n
fc0c0011: 0000 745f 0000 7300 0000 6f74 0000 6c61 ..t_..s...ot..la
This commit implements a workaround at least for the most blatant
problem: using memcpy() from NOR flash. We rename the assembler
routine into __memcpy() and provide a wrapper, which will use a
byte-wise copy loop for unaligned source or target addresses when
reading from NOR flash, and branch to the optimized __memcpy()
in all other cases, thus minimizing the performance impact.
Tested on lite5200b and TQM5200S.
Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Diffstat (limited to 'arch/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/Makefile | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index 5f85502d1c..bf23790c42 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -43,6 +43,11 @@ COBJS-y += time.o SRCS := $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c) OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y)) +# Workaround for local bus unaligned access problem on MPC5200 +ifdef CONFIG_MPC5200 +$(obj)ppcstring.o: AFLAGS += -Dmemcpy=__memcpy +endif + $(LIB): $(obj).depend $(OBJS) @if ! $(CROSS_COMPILE)readelf -S $(OBJS) | grep -q '\.fixup.*PROGBITS';\ then \ |