I have read a lot of messages posted on the forum criticising the make of ones own BOOTLOADER. But there are a lot of applications of writing ones own bootloader. It can be used for secracy of the code.
If anybody has managed to locate a website for sample of a bootloader or has made a bootloader of his own then please let me know the procedure of writing the code.
the P89V51Rx2 has a modifiable bootloader. The source code for the 'standard' bootloader is available. This chip only require FlashMagic start before a reset to initialize a load. You can modify the bootloader in the chip and, if your obfusciated code is in Intel hex, FM will transfer it to the bootloader.
FlashMagic is free from http://www.esacademu.com
This seems to me to be the simple approach.
Erik
That should be: http://www.esacademy.com/
Or even: www.esacademy.com/.../
well, I have yet to find a "thumb friendly" keyboard :)
as an anecdote I recall a service call "my keyboard spells wrong". after much amusement it was found out that the actual issue was that the keyboard inteface occasionally dropped a bit.