1. Warning command in makefile: Use -Wall, not all uppercase or lowercase. If all lowercase, the following error message will appear:
arm-none-linux-gnueabi-gcc: unrecognized option '-wall'
2. The main function in the c file must be of int type, not void type, otherwise:
warning: return type of 'main' is not 'int'
3. The = sign is required for addresses in assembly statements:
ldr r0,=0x56000000 //If there is no equal sign, this error will occur
crt0.s: Assembler messages:crt0.s:8: Error: bad immediate value for offset (1442840568) //crt0.s is the name of my assembly file
4. When using immediate numbers in assembly, add a # sign before the immediate number: mov r1,#0x0 Otherwise, the following error will occur:
crt0.s:8: Error: internal_relocation (type: OFFSET_IMM) not fixed up
.equ mem_ctl_base, 0x48000000
mov r1,#mem_ctl_base is equivalent to ldr r1,=mem_ctl_base
5. The registers and wiring diagrams corresponding to the LED and key of mini2440 are as follows:
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