Cortex A15 asm - compilers

1. gcc arm asm.

1) https://stackoverflow.com/questions/43948319/fatal-error-when-calling-arm-assembly-function-from-c

2. ti arm asm/

1) LDR r0,=0xFFFFFFFF what does the "="mean? https://comp.sys.arm.narkive.com/wYam79YG/ldr-r0-0xffffffff-what-does-the-mean (vpn)

2) Understanding PC (R15) register [ARM7] https://community.arm.com/support-forums/f/keil-forum/26293/understanding-pc-r15-register-arm7

3) Loading with LDR Rd, =const https://developer.arm.com/documentation/dui0204/j/writing-arm-assembly-language/loading-constants-into-registers/loading-with-ldr-rd---const

4) https://www.chegg.com/homework-help/questions-and-answers/executing-following-arm-instructions-ldr-r0-0xffffffff-mvn-r1-r0-values-nzc-flags-well-val-q93622605