Dear Simon, In message <CAPnjgZ1SfwRa_LXh0zu3Oug=gleuqx5mdccvqw90-fv5hvx...@mail.gmail.com> you wrote: > > > Yes, it takes one additional step, but it's simple and does not need > > extra code. > > It is actually not simple, for three reasons: > > 1. With zboot the args come from the kernel setup.bin and must be modified
Don't use zboot, then. In my opinion, zboot is crap and should never have been added, but there were so many requests for it. Nevertheless, the use of crippleware is a sin that carries with it its own punishment. Don't do it, then. Or, if you feel there is some value in zboot that should be conserved, fix it to work like the rest of U-Boot. > 2. With Chrome OS the args come from the kernel partition and must be > augmented / substituted OK. But then why can we not still use the standard variable substitution mechanism we already have? > 3. The above command cannot be in the same env var as anything else, > since substitution breaks in that case Sorry, I don't understand what you mean heare. What is "the same env var" versus "anything else"? Maybe you can give a specific example? > So you end up with a really complicated mess of environment variables > and scripts that is barely manageable. I want it to be simple. Again, I can't follow you. Why must there be a mess? > See here for example (this only deals with 3 above, not 1 and 2, which > would still need custom code without my series) > > https://chromium.googlesource.com/chromiumos/third_party/u-boot/+/refs/heads/chromeos-v2013.06/include/configs/chromeos.h#204 Sorry - all I see there is some complex settings if these make sense I can't tell) - but how would things be better if you could - for example - use "%U" instead of "${uuid}" as you suggested? Also, is your approach not necessarily limited? You can now think of a handful of variables you may want to pass, say root device, root partition, uuid, maybe MAC address etc. But the next user will need kernel args that you did not think of - so how do we proceed? Add all features anybody needs to that new code? That certainly does not scale. Or mix "%FOO" and "${foo}" style arguments? That's even worse. I really fail to see the benefits, I see only ugliness and problems. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de Good manners are the settled medium of social, as specie is of commercial, life; returns are equally expected for both. - Lord Chesterfield _Letters to his Son_, 25 December 1753
