mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-11-04 02:11:25 +01:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
|
|
* (C) Copyright 2010
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* This is a workaround for issues on the MPC5200, where unaligned
|
|
* 32-bit-accesses to the local bus will deliver corrupted data. This
|
|
* happens for example when trying to use memcpy() from an odd NOR
|
|
* flash address; the behaviour can be also seen when using "md" on an
|
|
* odd NOR flash address (but there it is not a bug in U-Boot, which
|
|
* only shows the behaviour of this processor).
|
|
*
|
|
* For memcpy(), we test if either the source or the target address
|
|
* are not 32 bit aligned, and - if so - if the source address is in
|
|
* NOR flash: in this case we perform a byte-wise (slow) then; for
|
|
* aligned operations of non-flash areas we use the optimized (fast)
|
|
* real __memcpy(). This way we minimize the performance impact of
|
|
* this workaround.
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <flash.h>
|
|
#include <linux/types.h>
|
|
|
|
void *memcpy(void *trg, const void *src, size_t len)
|
|
{
|
|
extern void* __memcpy(void *, const void *, size_t);
|
|
char *s = (char *)src;
|
|
char *t = (char *)trg;
|
|
void *dest = (void *)src;
|
|
|
|
/*
|
|
* Check is source address is in flash:
|
|
* If not, we use the fast assembler code
|
|
*/
|
|
if (((((unsigned long)s & 3) == 0) /* source aligned */
|
|
&& /* AND */
|
|
(((unsigned long)t & 3) == 0)) /* target aligned, */
|
|
|| /* or */
|
|
(addr2info((ulong)s) == NULL)) { /* source not in flash */
|
|
return __memcpy(trg, src, len);
|
|
}
|
|
|
|
/*
|
|
* Copying from flash, perform byte by byte copy.
|
|
*/
|
|
while (len-- > 0)
|
|
*t++ = *s++;
|
|
|
|
return dest;
|
|
}
|