On Thu, Jan 31, 2019 at 09:04:53PM +0200, Adrian Bunk wrote: > On Wed, Jan 30, 2019 at 05:47:03PM -0500, Tom Rini wrote: > > > > I would also ask if we should be enabling more stuff in busybox, period. > > I don't think the current status quo would be a good starting point for that. > > Before submitting I saw CONFIG_PATCH=y, which is a lot more of a > "Why would I ever need this on an embedded device?". > > Not saying that you are wrong, but the starting point should be a review > of the current config.
Yes, somewhere between an audit of busybox and making it easier / clearer on how to remove busybox on a "regular" image (core-image-*, etc) are on my TODO list. You might also get surprised btw where things like patch get, erm, differently-used in systems in automated ways. > > Customizing busybox for what you're trying to _do_ with a custom setup > > is one of those top 5 TODO items with making a cut down image and > > customizing the kernel config. Outside of -tiny and initramfs/similar > > cases, there's not a great reason to use > > almost-but-not-quite-complete-busybox-applet compared with the regular > > app. > > I frequently end up in projects where I do have great reason for that: > > For root filesystems of the 32-64 MB size it is not necessary to use a > different libc or use -Os, but using the busybox applets when they are > sufficient saves > 10% filesystem size compared to the full versions. > > E.g. 0.45 MB for a standalone tar is much when the little functionality > you actually need is also provided by the busybox applet. > > Plus there is also the convenience point that most of the tools you need > are already installed just by adding busybox with the default config. Right. This is the -tiny and similar cases. Busybox is great for a lot of things. But there's also common cases where it's not. But the reasons I object here are, aside from what others have brought up about devmem vs devmem2 vs putting stuff in DTS files, etc, is that I really don't want to see more implicit deps to busybox added in. busybox is in virtually every single OE fs image, so I am going to argue that every new utility we add there needs a real good justification. -- Tom
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