In message <[EMAIL PROTECTED]> you wrote: > > We recently debugged a problem where a Flash write on > MPC8349E and MPC8349EA processor boards was accidentally > occurring during board initialization.
A write to flash should not matter at all. > Under the right conditions, the write appears to put > the flash into a command-mode, rather than read-data mode, Hm... all flash devices I know of require a certain command sequence to be written, which should never happen "by accident". Agreed, Intel flashes are braindead by accepting the writes to arbitrary addresses within the same sector, so writing a binary image sequentially to a flash memory space may easily trigger such a problem - but this should never happen in U-Boot code. > and further reads from the flash return invalid data > (as far as the processor is concerned). The write was > coming from drivers code that we had not introduced, Which exact driver are you referring to? If any driver has such a bug, it should be fixed. > The MPC8349 processor base register has the option; > BRn[WP] = 1, that could be used to disable writes to the > boot flash. This local bus controller register is likely ... > Writes to boot Flash could be disabled early on in the > boot sequence, and then enabled again after relocation. > This would protect against writes to the boot flash. This is not the way to go. Hushing up problems has never been a solution. Instead, let's find and fix the culprit. > I figured I'd gauge if there was any interest in adding > this feature before looking into it further. Frankly: I saee this as a non-issue. Let's rather fix the bug instead. 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] A mouse is an elephant built by the Japanese. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
