[U-Boot] standalone app hello_world.bin crashes

[U.Mutlu]

# CC W.D., T.R.


I tried to run hello_world.bin (in examples/standalone)
on the target device, but it crashes with "undefined instruction".

I followed the steps in the doc at 
https://www.denx.de/wiki/view/DULG/UBootStandalone.
The said example is generated together with u-boot itself;
u-boot works ok, but the example crashes:

=> fatload mmc 0 0x42000000 hello_world.bin ; go 0x42000000 a b c d
570 bytes read in 2 ms (278.3 KiB/s)
## Starting application at 0x42000000 ...
undefined instruction
pc : [<42000718>]          lr : [<7ef7c633>]
reloc pc : [<0d086718>]    lr : [<4a002633>]
sp : 7af51eb8  ip : 0000000c     fp : 00000006
r10: 7af68c28  r9 : 7af59ed8     r8 : 7efd5154
r7 : 7ef8fa25  r6 : 00000006     r5 : 42000000  r4 : 7af68c2c
r3 : 42000000  r2 : 7af68c2c     r1 : 7af68c2c  r0 : 00000005
Flags: nzCv  IRQs off  FIQs off  Mode SVC_32
Code: 35303753 30303234 31303030 0a0d3742 (ffffffff)
Resetting CPU ...

resetting ...


=> version
U-Boot 2019.04-00077-g48ff1bc4f0 (Apr 11 2019 - 07:40:39 +0200) Allwinner 
Technology

arm-linux-gnueabihf-gcc (GCC) 9.0.1 20190326 (experimental) [trunk revision 
269955]
GNU ld (GNU Binutils) 2.32.51.20190326


=> bdi
arch_number = 0x100010bb
boot_params = 0x40000100
DRAM bank   = 0x00000000
-> start    = 0x40000000
-> size     = 0x40000000
baudrate    = 115200 bps
TLB addr    = 0x7eff0000
relocaddr   = 0x7ef7a000
reloc off   = 0x34f7a000
irq_sp      = 0x7af52000
sp start    = 0x7af51ff0
FB base     = 0x7fb00000
Early malloc usage: 134 / 400
fdt_blob    = 0x7af52018


root at xy:/.../u-boot/examples/standalone# 
../../../TOOLCHAIN/bin/arm-linux-gnueabihf-nm -n hello_world
42000000 T hello_world
42000090 T dummy
42000090 T get_version
42000098 T getc
420000a0 T tstc
420000a8 T putc
420000b0 T puts
420000b8 T printf
420000c0 T install_hdlr
420000c8 T free_hdlr
420000d0 T malloc
420000d8 T free
420000e0 T udelay
420000e8 T get_timer
420000f0 T vprintf
420000f8 T do_reset
42000100 T env_get
42000108 T env_set
42000110 T simple_strtoul
42000118 T strict_strtoul
42000120 T simple_strtol
42000128 T strcmp
42000130 T i2c_write
42000138 T i2c_read
42000140 T spi_setup_slave
42000148 T spi_free_slave
42000150 T spi_claim_bus
42000158 T spi_release_bus
42000160 T spi_xfer
42000168 T ustrtoul
42000170 T ustrtoull
42000178 T strcpy
42000180 T mdelay
42000188 T memset
42000194 T app_startup
4201023a R __bss_end__
4201023a R _bss_end__
4201023a R __bss_start
4201023a R __bss_start__
4201023a R _edata
4201023c R _end
4201023c R __end__


-- 
U.Mutlu