hi Arn Ks, thx for your reply. So there is no global variables during the decompress process of kernel. best regards 2014-05-12 14:06 GMT+08:00 Arun KS <getarunks@gmail.com>:

Hi Chuck Huang,

On Thu, May 8, 2014 at 5:25 PM, Chuck Huang <chuck.kernel@gmail.com> wrote:

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Dear all,

Now i am looking into kernel decompressed code, arch/arm/boot/compressed/head.S

As i objdump arch/arm/boot/compressed/vmlinux, the start section address is 0x0.

vmlinux.S 373789| Disassembly of section .text: 373790| 373791| 00000000 <start>: 373792| #endif

if the code run in 0x8000 0000(which is DDR base address), but the link address is zero, how it works ?

The compressed/head.S code is position independent code. It can be loaded anywhere in RAM. There will not be reference to any labels directly. All the address references are done relative to PC.

Thanks, Arun

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best regards

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