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1 | Creation of the self-extracting compressed kernel image (vmlinuz) | ||
2 | ----------------------------------------------------------------- | ||
3 | $Id: README,v 1.1 2001/12/17 13:59:27 bjornw Exp $ | ||
4 | |||
5 | This can be slightly confusing because it's a process with many steps. | ||
6 | |||
7 | The kernel object built by the arch/etrax100/Makefile, vmlinux, is split | ||
8 | by that makefile into text and data binary files, vmlinux.text and | ||
9 | vmlinux.data. | ||
10 | |||
11 | Those files together with a ROM filesystem can be catted together and | ||
12 | burned into a flash or executed directly at the DRAM origin. | ||
13 | |||
14 | They can also be catted together and compressed with gzip, which is what | ||
15 | happens in this makefile. Together they make up piggy.img. | ||
16 | |||
17 | The decompressor is built into the file decompress.o. It is turned into | ||
18 | the binary file decompress.bin, which is catted together with piggy.img | ||
19 | into the file vmlinuz. It can be executed in an arbitrary place in flash. | ||
20 | |||
21 | Be careful - it assumes some things about free locations in DRAM. It | ||
22 | assumes the DRAM starts at 0x40000000 and that it is at least 8 MB, | ||
23 | so it puts its code at 0x40700000, and initial stack at 0x40800000. | ||
24 | |||
25 | -Bjorn | ||