diff --git a/THOUGHTS.txt b/THOUGHTS.txt index b2a7bcb..be3bcd6 100644 --- a/THOUGHTS.txt +++ b/THOUGHTS.txt @@ -1432,3 +1432,67 @@ has some overhead (see here). Thus, if you have a small flash device Argh. Oh well, + +Sat Apr 1 15:27:39 BST 2023 + +There's limited value in recreating pseudofiles for jffs2 because +the system is writable - changes made to /bin, /dev etc in config.filesystem +should take effect on a running system. + +Can we take inspiration from https://grahamc.com/blog/erase-your-darlings/ ? + +in early boot: + mount ramfs on / + mount the writeable filesystem on /persist/ + bind mount /persist/nix on /nix + run script to populate rootfs from pseudofiles + +on a router, do we need _anything_ persistent that's outside the store? + + - state for dhcp leases and stuff + - secrets + - maybe, files that the user has downloaded + +this will probably require initramfs. if just use jffs2 as the rootfs and +don't worry about /persist, we can skip that step. + + + + +[ aside: I think we may be putting two busyboxes in the image: +see modules/s6/default.nix s6-init-scripts has buildInputs = [busybox]; ] + +Mon Apr 3 18:34:26 BST 2023 + +suppose +- we boot the system with systemConfig=/nix/store/eeeeee-system +- the early-init script runs /target/$systemConfig/create-root /target + after mounting /target +- then it runs chroot /target $systemConfig/bin/init "$@" + +or maybe we could combine those steps? +or maybe it doesn't matter too much ... + +Thu Apr 6 21:25:41 BST 2023 + +what now? + +- put a jffs2 onto some hardware device + - what do we do with uboot? + - should we pad the kernel? + - maybe kernel module support would be good if we're making it + hard to do kernel updates +- try the nix-copy-closure thing and work out what else we don't know +- [done] detect endian correctly + + +to ask a different question, what else do we need to dogfood a router? + +Sun Apr 9 10:06:08 BST 2023 + +- rename outputs.flashable to outputs.flashimage +- rename modules/flashable to modules/flashable_ro +- create outputs.flashable in modules/jffs2 +- rename modules/jffs2 to modules/flashable_rw +- add enable config to both? +- enable kernel module compilation