1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
//==========================================================================
//
// flash_erase_block.c
//
// Flash programming
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas, msalter
// Date: 2000-12-07
// Purpose:
// Description:
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include "flash.h"
#include <pkgconf/hal.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/hal_cache.h>
int flash_erase_block(volatile unsigned long *block)
__attribute__ ((section (".2ram.flash_erase_block")));
int flash_erase_block(volatile unsigned long *block)
{
volatile unsigned long *ROM;
unsigned long stat;
int timeout = 50000;
int len;
FLASH_WRITE_ENABLE();
block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);
ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);
// Clear any error conditions
ROM[0] = FLASH_Clear_Status;
// Erase block
ROM[0] = FLASH_Block_Erase;
*block = FLASH_Confirm;
timeout = 5000000;
while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {
if (--timeout == 0) break;
}
// Restore ROM to "normal" mode
ROM[0] = FLASH_Reset;
// If an error was reported, see if the block erased anyway
if (stat & 0x007E007E) {
len = FLASH_BLOCK_SIZE;
while (len > 0) {
if (*block++ != 0xFFFFFFFF) break;
len -= sizeof(*block);
}
if (len == 0) stat = 0;
}
FLASH_WRITE_DISABLE();
return stat;
}
|
