Just had a further thought about what to do if the main bootstrap loader gets trashed that maybe easier to implement. Rather than a stage 1 bootstrap loader looking to the USB interface for a replacement how about looking on the SD card?
Simon On Thu, 2007-05-17 at 01:58 -0300, Werner Almesberger wrote: > Simon Matthews wrote: > > It seems to me as someone who designs and makes embedded devices (mainly > > using the Freescale MC9S12 processors) that you need another lower level > > bootstrap loader that is small, > > Ah yes, we've been through that idea as well :-) > > We rejected it, because we don't want to have yet more code > duplicating functionality found elsewhere to maintain. Besides, it > wouldn't be all that trivial, given that we don't have any "simple" > interfaces. (Anything that needs a debug board or other fancy > adapters doesn't count.) > > Also, there really isn't much difference between a few protected > bytes or hundreds of protected kilobytes. We need an extra chip > anyway, and if we want something reasonably small and modern, it'll > have plenty of space. Thus there's no penalty in using it. > > But yes, the "small loader" approach works well enough in other > contexts. I've used it myself. > > - Werner >
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