Dear Jonas Gorski, In message <20130503183128.00000900@unknown> you wrote: > > > > And this isn't from me, but this is how most firmware images are > > > > Define "most". > > Most images I have seen for kirkwood, ar71xx, ralink, and I'm sure > there are more.
Maybe these do - but these are a tiny, virtually invisible minority of the platforms supported in mainline. > > Yes, because in U-Boot we have no notion of "files" and thus no > > indication where an image ends. Otherwise such a check would be > > there. > > > > > It checks the crc of the first ih_size bytes after the image_header > > > - and my change changes mkimage to mirror that behaviour. > > > > But this is wrong. > > But that's what U-Boot does. The quoted code is taken straight from > git. My impression was that if U-Boot accepts this image, then mkimage > should, too. I explained this before: in U-Boot we have no way to figure out the total size (or "file size") as there is no such concept as files. For U-Boot, an image is only identified by it's start address in memory, but we have no length information available, so how could we check it? > Okay, after a bit of IRC discussion the following compromise: > > If the header is correct, and the crc is correct for the ih_size data, > then assume everything is fine, but print out a warning if the file > length does not match the header lengh + ih_size. No, this was not exactly what we discussed. I wrote: | I suggest you change mkimage such that it will display the (valid) | image data, but then bail out with a "NNN bytes excess data present" | error message. Note that mkimage must return an error code (EFAILURE) | in this case. So no warning, but an error, please. And only for excess lenght. If the length is too short, we are really in trouble, especially if the CRC still matches. This should never happen. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: [email protected] If there was anything that depressed him more than his own cynicism, it was that quite often it still wasn't as cynical as real life. - Terry Pratchett, _Guards! Guards!_ _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
