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460c2ce3 WD |
1 | /* |
2 | * (C) Copyright 2010 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
460c2ce3 WD |
6 | */ |
7 | ||
8 | /* | |
9 | * This is a workaround for issues on the MPC5200, where unaligned | |
10 | * 32-bit-accesses to the local bus will deliver corrupted data. This | |
11 | * happens for example when trying to use memcpy() from an odd NOR | |
12 | * flash address; the behaviour can be also seen when using "md" on an | |
13 | * odd NOR flash address (but there it is not a bug in U-Boot, which | |
14 | * only shows the behaviour of this processor). | |
15 | * | |
16 | * For memcpy(), we test if either the source or the target address | |
17 | * are not 32 bit aligned, and - if so - if the source address is in | |
18 | * NOR flash: in this case we perform a byte-wise (slow) then; for | |
19 | * aligned operations of non-flash areas we use the optimized (fast) | |
20 | * real __memcpy(). This way we minimize the performance impact of | |
21 | * this workaround. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <common.h> | |
26 | #include <flash.h> | |
27 | #include <linux/types.h> | |
28 | ||
29 | void *memcpy(void *trg, const void *src, size_t len) | |
30 | { | |
31 | extern void* __memcpy(void *, const void *, size_t); | |
32 | char *s = (char *)src; | |
33 | char *t = (char *)trg; | |
de8c9317 | 34 | void *dest = (void *)trg; |
460c2ce3 WD |
35 | |
36 | /* | |
37 | * Check is source address is in flash: | |
38 | * If not, we use the fast assembler code | |
39 | */ | |
40 | if (((((unsigned long)s & 3) == 0) /* source aligned */ | |
41 | && /* AND */ | |
42 | (((unsigned long)t & 3) == 0)) /* target aligned, */ | |
43 | || /* or */ | |
44 | (addr2info((ulong)s) == NULL)) { /* source not in flash */ | |
45 | return __memcpy(trg, src, len); | |
46 | } | |
47 | ||
48 | /* | |
49 | * Copying from flash, perform byte by byte copy. | |
50 | */ | |
51 | while (len-- > 0) | |
52 | *t++ = *s++; | |
53 | ||
54 | return dest; | |
55 | } |