blob: 5066941be05a372e4f3718c89811bfb1ebeae9fb (
plain) (
blame)
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
|
/*
* This is where the real hardware setup is done. A minimal stack
* has been provided by the start.S code. No normal C or RTEMS
* functions can be called from here.
*
* This routine is pretty simple for the uC5235 because all the hard
* work has been done by the bootstrap dBUG code.
*/
#include <rtems.h>
#include <bsp.h>
#define MM_SDRAM_BASE (0x00000000)
/*
* MCF5235_BSP_START_FROM_FLASH comes from the linker script
* If it is set to 0 then it is assumed that the motorola debug monitor
* is present and we do not need to re-initialize the SDRAM. Otherwise,
* if it is set to 1 then we want to boot our own code from flash and we
* do need to initialize the SDRAM.
*/
extern uint32_t MCF5235_BSP_START_FROM_FLASH;
extern void CopyDataClearBSSAndStart (void);
extern void INTERRUPT_VECTOR(void);
extern void CopyVectors(const uint32_t* old, uint32_t* new);
void Init5235 (void)
{
int x;
volatile int temp = 0;
int *address_of_MCF5235_BSP_START_FROM_FLASH;
/*Setup the GPIO Registers */
MCF5235_GPIO_UART=0x3FFF;
MCF5235_GPIO_PAR_AD=0xE1;
/*Setup the Chip Selects so CS0 is flash */
MCF5235_CS_CSAR0 =(0xFFE00000 & 0xffff0000)>>16;
MCF5235_CS_CSMR0 = 0x001f0001;
MCF5235_CS_CSCR0 = 0x1980;
address_of_MCF5235_BSP_START_FROM_FLASH = (int *) & MCF5235_BSP_START_FROM_FLASH;
if ( (int)address_of_MCF5235_BSP_START_FROM_FLASH == 1) {
/*Setup the SDRAM */
for(x=0; x<20000; x++)
{
temp +=1;
}
MCF5235_SDRAMC_DCR = 0x042E;
MCF5235_SDRAMC_DACR0 = 0x00001300;
MCF5235_SDRAMC_DMR0 = (0x00FC0000) | (0x00000001);
for(x=0; x<20000; x++)
{
temp +=1;
}
/* set ip ( bit 3 ) in dacr */
MCF5235_SDRAMC_DACR0 |= (0x00000008) ;
/* init precharge */
*((unsigned long *)MM_SDRAM_BASE) = 0xDEADBEEF;
/* set RE in dacr */
MCF5235_SDRAMC_DACR0 |= (0x00008000);
/* wait */
for(x=0; x<20000; x++)
{
temp +=1;
}
/* issue IMRS */
MCF5235_SDRAMC_DACR0 |= (0x00000040);
*((short *)MM_SDRAM_BASE) = 0;
for(x=0; x<60000; x++)
{
temp +=1;
}
*((unsigned long*)MM_SDRAM_BASE)=0x12345678;
} /* we have finished setting up the sdram */
/* Copy the interrupt vector table to address 0x0 in SDRAM */
CopyVectors((const uint32_t *)&INTERRUPT_VECTOR, (uint32_t*)0);
m68k_set_vbr(0);
/*
* Copy data, clear BSS and call boot_card()
*/
CopyDataClearBSSAndStart ();
}
|
