Dear Simon, In message <CAPnjgZ1y+i0FdawcbBuOi0+SC+Xq3AS=zztti1tvjv8ccnw...@mail.gmail.com> you wrote: > > > U-Boot shall not initialize all possible available devices, but always > > only those that it needs itself to perform it's task, which usually is > > just to load and start an OS. =A0It makes no sense to initialize all > > network interfaces (and eventually wait for the link to come up), to > > initialize all attached disk drives (and wait for them to spin up) or > > to scan the whole USB bus and initialize all attached devices when we > > don't need any of these to boot the OS. > > > > Suchinitializations shall always be done on demand only, i. e. when a > > command is run that accesses any such device. > > Yes thanks for pointing that out. I am really thinking of the init > sequence in board_init_r() where we init NAND, MMC and the like. So
I'm thinking of that, too. This list initializes a lot of things it actually should not. When this code got written, we had only a few boards, an all init steps took just a few milliseconds, so it appeared a good idea to print a "complete" system status at boot - always. Now we don't consider this approach practical any more, especially when targetting for short boot times. When introducing a device model, one of the tasks will be to change this part, too. > On the other hand I think serial could benefit from a unified driver > model quite nicely :-) Agreed, and not only serial. > OK good. There seem to be a lot of different activities going on, as > Graeme says in the other thread. Indeed. I'm actually amazed how many different things suddenly start moving :-) 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: w...@denx.de There are no data that cannot be plotted on a straight line if the axis are chosen correctly. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
