]>
Commit | Line | Data |
---|---|---|
51533b61 MS |
1 | Creation of the self-extracting compressed kernel image (vmlinuz) |
2 | ----------------------------------------------------------------- | |
51533b61 MS |
3 | |
4 | This can be slightly confusing because it's a process with many steps. | |
5 | ||
6 | The kernel object built by the arch/etrax100/Makefile, vmlinux, is split | |
7 | by that makefile into text and data binary files, vmlinux.text and | |
8 | vmlinux.data. | |
9 | ||
10 | Those files together with a ROM filesystem can be catted together and | |
11 | burned into a flash or executed directly at the DRAM origin. | |
12 | ||
13 | They can also be catted together and compressed with gzip, which is what | |
14 | happens in this makefile. Together they make up piggy.img. | |
15 | ||
16 | The decompressor is built into the file decompress.o. It is turned into | |
17 | the binary file decompress.bin, which is catted together with piggy.img | |
18 | into the file vmlinuz. It can be executed in an arbitrary place in flash. | |
19 | ||
20 | Be careful - it assumes some things about free locations in DRAM. It | |
21 | assumes the DRAM starts at 0x40000000 and that it is at least 8 MB, | |
22 | so it puts its code at 0x40700000, and initial stack at 0x40800000. | |
23 | ||
24 | -Bjorn |