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    Can I have the meaning of why r3,r4 registers are called scratch registers
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    Hi, I am doing a writel to a PCIe device which is taking around 3msec due to link in low power state. writel translates to wmb followed by STR asm instruction. My question is, while ARM performing...
  • I want to know meaning of r12 register.
    Hi expert. I want to know meaning of r12 regiseter. this register some time using frame pointer (compiler option) I think caller save register is r0-r3, and callee save register is r4~r15. but my code...