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
|
#include <asm/barebox-arm.h>
#include <asm/cache.h>
#include <common.h>
#include <linux/sizes.h>
#include <mach/platform.h>
#include <of.h>
#include "lowlevel.h"
static void copy_vc_fdt(void *dest, void *src, unsigned long max_size)
{
struct fdt_header *oftree_src = src;
struct fdt_header *oftree_dest = dest;
unsigned long size;
if (!src) {
oftree_dest->magic = cpu_to_be32(VIDEOCORE_FDT_ERROR);
oftree_dest->totalsize = cpu_to_be32(0);
return;
}
size = be32_to_cpu(oftree_src->totalsize);
if (size > max_size) {
oftree_dest->magic = cpu_to_be32(VIDEOCORE_FDT_ERROR);
/* Save an error code after the magic value for easier
* debugging. We can't print out anything this early */
oftree_dest->totalsize = cpu_to_be32(ENOMEM);
return;
}
memmove(dest, src, size);
}
/* Must be inline since stack isn't setup yet. */
static inline void start_raspberry_pi(unsigned long memsize, void *fdt,
void *vc_fdt)
{
void *saved_vc_fdt;
unsigned long membase = BCM2835_SDRAM_BASE;
/* A pointer to the FDT created by VideoCore was passed to us in r2. We
* reserve some memory just above the region used for Basebox and copy
* this FDT there. We fetch it from there later in rpi_devices_init().*/
memsize -= VIDEOCORE_FDT_SZ;
arm_cpu_lowlevel_init();
/* Copied from barebox_arm_entry(). We need stack here early
* for normal function calls to work. */
arm_setup_stack(arm_mem_stack_top(membase, membase + memsize));
fdt += get_runtime_offset();
saved_vc_fdt = (void *)(membase + memsize);
copy_vc_fdt(saved_vc_fdt, vc_fdt, VIDEOCORE_FDT_SZ);
barebox_arm_entry(membase, memsize, fdt);
}
extern char __dtb_bcm2835_rpi_start[];
ENTRY_FUNCTION(start_raspberry_pi1, r0, r1, r2)
{
start_raspberry_pi(SZ_128M, __dtb_bcm2835_rpi_start, (void *)r2);
}
extern char __dtb_bcm2836_rpi_2_start[];
ENTRY_FUNCTION(start_raspberry_pi2, r0, r1, r2)
{
start_raspberry_pi(SZ_512M, __dtb_bcm2836_rpi_2_start, (void *)r2);
}
extern char __dtb_bcm2837_rpi_3_start[];
ENTRY_FUNCTION(start_raspberry_pi3, r0, r1, r2)
{
start_raspberry_pi(SZ_512M, __dtb_bcm2837_rpi_3_start, (void *)r2);
}
extern char __dtb_bcm2837_rpi_cm3_start[];
ENTRY_FUNCTION(start_raspberry_pi_cm3, r0, r1, r2)
{
start_raspberry_pi(SZ_512M, __dtb_bcm2837_rpi_cm3_start, (void *)r2);
}
|
