Hello Everyone I am trying to program bare metal over the UDOO. With this in mind I compiled UBOOT with its Hello World example code. After get UBOOT running, my surprise is that it crushes when I try to execute the hello_world.bin. Here it is the error message: ====================================================== U-Boot 2015.10-rc1-dirty (Oct 01 2015 - 09:02:12 +0000) CPU: Freescale i.MX6Q rev1.2 996 MHz (running at 792 MHz) Reset cause: POR Board: Udoo DRAM: 1 GiB MMC: FSL_SDHC: 0 *** Warning - bad CRC, using default environment In: serial Out: serial Err: serial Net: using phy at 6 FEC [PRIME] Hit any key to stop autoboot: 0 => load mmc 0 0x20000000 hello_world.bin 562 bytes read in 27 ms (19.5 KiB/s) => go 0x20000000 ## Starting application at 0x20000000 ... undefined instruction pc : [<20000014>] lr : [<4ff813b4>] reloc pc : [<e7884014>] lr : [<178053b4>] sp : 4fd79da8 ip : 00000030 fp : 4fd7e2c8 r10: 00000002 r9 : 4fd79f00 r8 : 4ffb8dc8 r7 : 4fd7a758 r6 : 20000000 r5 : 00000002 r4 : 4fd7a75c r3 : 20000000 r2 : 4fd7a75c r1 : 4fd7a75c r0 : 00000001 Flags: nZCv IRQs off FIQs off Mode SVC_32 Resetting CPU ... resetting ... ====================================================== The assembly code is the following: examples/standalone/hello_world: file format elf32-littlearm Disassembly of section .text: 20000000 <hello_world>: 20000000: b570 push {r4, r5, r6, lr} 20000002: 4605 mov r5, r0 20000004: 4608 mov r0, r1 20000006: 460e mov r6, r1 20000008: f000 f8c0 bl 2000018c <app_startup> 2000000c: 2108 movs r1, #8 2000000e: 4816 ldr r0, [pc, #88] ; (20000068 <hello_world+0x68>) 20000010: 2400 movs r4, #0 20000012: f000 f84d bl 200000b0 <printf> 20000016: f000 f837 bl 20000088 <dummy> 2000001a: 4601 mov r1, r0 2000001c: 4813 ldr r0, [pc, #76] ; (2000006c <hello_world+0x6c>)====================================================== I checked what is in memory to be sure that it is not a problem coping the file: => mm 0x20000010 20000010: f0002400 ? 20000014: f000f84d ? 20000018: 4601f837 ? ====================================================== I have checked the ISA of the ARMv7 and the instruction ( f000 f8c0) seems to be valid. Everything is compiled with the arm-none-eabi-gcc, and UBOOT seems to run correctly, so I suppose that it is not a problem of the compiler. Anyone has any idea what is happening? Thanks for your time
