Hi all,
I have a issue about BBB FDT: I add " bl bsp_fdt_copy " in
c/src/lib/libbsp/arm/shared/start/start.S, when my test exe(modify the
testsuites/libtests/libfdt01) boot, came out a error: data abort.
Boot output error info:
data abort
pc : [<80000df0>] lr : [<8000004c>]
sp : 9f62a960 ip : ffffffff fp : 9f7a34ec
r10: 00000000 r9 : 9f62af28 r8 : 9f633714
r7 : 00000000 r6 : 88000000 r5 : 00000e05 r4 : 800158ac
r3 : 0002ad24 r2 : 88000000 r1 : 00000e05 r0 : 00000000
Flags: nzcv IRQs off FIQs on Mode SVC_32
Resetting CPU ...
resetting ...
I set the BSP_FDT_BLOB_SIZE_MAX 262144 bytes.
I disassemble my test binary and take a look at the start.S, the info show
below:
80000040 <_start>:
/*
* We do not save the context since we do not return to the boot
* loader but preserve r1 and r2 to allow access to bootloader
parameters
*/
#ifndef BSP_START_NEEDS_REGISTER_INITIALIZATION
mov r5, r1 /* machine type number or ~0 for DT boot */
80000040: e1a05001 mov r5, r1
mov r6, r2 /* physical address of ATAGs or DTB */
80000044: e1a06002 mov r6, r2
#else /* BSP_START_NEEDS_REGISTER_INITIALIZATION */
bl bsp_start_init_registers_core
#endif
#ifdef U_BOOT_USE_FDT
bl bsp_fdt_copy
80000048: eb00035b bl 80000dbc <bsp_fdt_copy>
/* Calculate stack offset */
ldr r1, =bsp_stack_all_size
mul r1, r0
#endif
void bsp_fdt_copy(const void *src)
{
80000dbc: e92d4010 push {r4, lr}
const uint32_t *s = (const uint32_t *) src;
#ifdef BSP_FDT_BLOB_READ_ONLY
uint32_t *d = (uint32_t *) ((uintptr_t) &bsp_fdt_blob[0]
- (uintptr_t) bsp_section_rodata_begin
+ (uintptr_t) bsp_section_rodata_load_begin);
80000dc0: e30538ac movw r3, #22700 ; 0x58ac
80000dc4: e3054478 movw r4, #21624 ; 0x5478
80000dc8: e3483001 movt r3, #32769 ; 0x8001
80000dcc: e3484001 movt r4, #32769 ; 0x8001
80000dd0: e0833004 add r3, r3, r4
80000dd4: e3054478 movw r4, #21624 ; 0x5478
80000dd8: e3484001 movt r4, #32769 ; 0x8001
80000ddc: e0434004 sub r4, r3, r4
#else
uint32_t *d = &bsp_fdt_blob[0];
#endif
if (s != d) {
80000de0: e1500004 cmp r0, r4
80000de4: 08bd8010 popeq {r4, pc}
uint32_t m = MIN(sizeof(bsp_fdt_blob), fdt_totalsize(src));
80000de8: e5903004 ldr r3, [r0, #4]
80000dec: e3082698 movw r2, #34456 ; 0x8698
return (__force fdt16_t)CPU_TO_FDT16(x);
}
static inline uint32_t fdt32_to_cpu(fdt32_t x)
{
return (__force uint32_t)CPU_TO_FDT32(x);
80000df0: e7e7e453 ubfx lr, r3, #8, #8
80000df4: e7e7c853 ubfx ip, r3, #16, #8
80000df8: e1a01c23 lsr r1, r3, #24
80000dfc: e1811c03 orr r1, r1, r3, lsl #24
80000e00: e181180e orr r1, r1, lr, lsl #16
80000e04: e181140c orr r1, r1, ip, lsl #8
80000e08: e1510002 cmp r1, r2
80000e0c: 21a01002 movcs r1, r2
uint32_t n = (m + sizeof(*d) - 1) / sizeof(*d);
80000e10: e2812003 add r2, r1, #3
uint32_t i;
for (i = 0; i < n; ++i) {
80000e14: e1b02122 lsrs r2, r2, #2
80000e18: 0a000007 beq 80000e3c <bsp_fdt_copy+0x80>
80000e1c: e0802102 add r2, r0, r2, lsl #2
80000e20: e1a03000 mov r3, r0
80000e24: e0440000 sub r0, r4, r0
80000e28: e080c003 add ip, r0, r3
d[i] = s[i];
80000e2c: e493e004 ldr lr, [r3], #4
for (i = 0; i < n; ++i) {
80000e30: e1530002 cmp r3, r2
d[i] = s[i];
80000e34: e58ce000 str lr, [ip]
for (i = 0; i < n; ++i) {
80000e38: 1afffffa bne 80000e28 <bsp_fdt_copy+0x6c>
}
rtems_cache_flush_multiple_data_lines(d, m);
80000e3c: e1a00004 mov r0, r4
}
}
80000e40: e8bd4010 pop {r4, lr}
rtems_cache_flush_multiple_data_lines(d, m);
80000e44: ea000027 b 80000ee8
<rtems_cache_flush_multiple_data_lines>
Best Regards
Sichen Zhao
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