| Creation of the self-extracting compressed kernel image (vmlinuz) |
| ----------------------------------------------------------------- |
| |
| This can be slightly confusing because it's a process with many steps. |
| |
| The kernel object built by the arch/etrax100/Makefile, vmlinux, is split |
| by that makefile into text and data binary files, vmlinux.text and |
| vmlinux.data. |
| |
| Those files together with a ROM filesystem can be catted together and |
| burned into a flash or executed directly at the DRAM origin. |
| |
| They can also be catted together and compressed with gzip, which is what |
| happens in this makefile. Together they make up piggy.img. |
| |
| The decompressor is built into the file decompress.o. It is turned into |
| the binary file decompress.bin, which is catted together with piggy.img |
| into the file vmlinuz. It can be executed in an arbitrary place in flash. |
| |
| Be careful - it assumes some things about free locations in DRAM. It |
| assumes the DRAM starts at 0x40000000 and that it is at least 8 MB, |
| so it puts its code at 0x40700000, and initial stack at 0x40800000. |
| |
| -Bjorn |
