_TEXT_PHY_BASE与_TEXT_BASE各代表什么意思?
ldr r0, =0xff000fff
bic r1, pc, r0 /* r0 <- current base addr of code */
ldr r2, _TEXT_BASE /* r1 <- original base addr in ram */
bic r2, r2, r0 /* r0 <- current base addr of code */
cmp r1, r2 /* compare r0, r1 */
beq after_copy /* r0 == r1 then skip flash copy */
上述代码中,为何将ldr r0, =0xff000fff,0xff000fff如何计算出来的?