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Author | SHA1 | Date |
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Daniel Barlow | e8e0de0284 | |
Daniel Barlow | 6920ee765d |
36
THOUGHTS.txt
36
THOUGHTS.txt
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@ -4044,8 +4044,36 @@ will depend on whether there's a writable fs or not, which is unexpected)
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Tue Feb 13 22:31:03 GMT 2024
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the reason we can't reboot is that there is a service to add each lan
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device to the bridge which does ifwait $dev running, which doesn't
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* the reason we can't reboot is that there is a service to add each
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lan device to the bridge which does ifwait $dev running, which doesn't
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return until there's something plugged in. So s6-rc hangs indefinitely
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until the lan switch is fully populated. This is definitely a
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"next milestone" thing
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until the lan switch is fully populated. This is definitely a "next
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milestone" thing.
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* another example of "thing that depends on other thing but which it
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is actually OK if neither of them happen" might be "mount a
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filesystem if there is a usb mass storage device attached"
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* I don't know if failover also fits into the model we don't quite
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have. LTE route depends on pppoe not being healthy
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we can have services (or bundles) that aren't part of the default target,
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and plumb them into events of some kind (netlink?) to bring them up/down?
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we can use s6-rc instanced services:
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https://skarnet.org/software/s6/instances.html
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"s6-instance-create and s6-instance-delete are relatively expensive operations, because they have to recursively copy or delete directories and use the synchronization mechanism with the instance supervisor, compared to s6-instance-control which only has to send commands to already existing supervisors. If you are going to turn instances on and off on a regular basis, it is more efficient to keep the instance existing and control it with s6-instance-control than it is to repeatedly create and delete it. "
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Probably we need something that reads netlink messages and converts
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them to a format that we can use to control services. Is there a
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benefit to using services here and not just running commands? it means
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the system state change we desire will stay changed.
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TODO items not to lose track of
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- speed testing (iperf)
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- make gl-ar750 tftpboot build again
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- finish belkin
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- install sniproxy
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- is there something simple we can do to make it reboot again?
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@ -7,6 +7,7 @@
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let
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inherit (lib) mkOption types concatStringsSep;
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cfg = config.boot.tftp;
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hw = config.hardware;
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in {
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imports = [ ../ramdisk.nix ];
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options.boot.tftp = {
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@ -22,6 +23,10 @@ in {
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type = types.bool;
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default = false;
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};
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appendDTB = mkOption {
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type = types.bool;
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default = false;
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};
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};
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options.system.outputs = {
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tftpboot = mkOption {
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@ -62,24 +67,46 @@ in {
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uimage = "bootm";
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zimage = "bootz";
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}; in choices.${cfg.kernelFormat};
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cmdline = concatStringsSep " " config.boot.commandLine;
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objcopy = "${pkgs.stdenv.cc.bintools.targetPrefix}objcopy";
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stripAndZip = ''
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${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S vmlinux.elf vmlinux.bin
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rm -f vmlinux.bin.lzma ; lzma -k -z vmlinux.bin
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'';
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in
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pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc ]; } ''
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pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc pkgs.stdenv.cc ubootTools ]; } ''
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mkdir $out
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cd $out
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binsize() { local s=$(stat -L -c %s $1); echo $(($s + 0x1000 &(~0xfff))); }
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binsize64k() { local s=$(stat -L -c %s $1); echo $(($s + 0x10000 &(~0xffff))); }
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hex() { printf "0x%x" $1; }
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rootfsStart=${toString cfg.loadAddress}
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rootfsSize=$(binsize64k ${o.rootfs} )
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rootfsSize=$(($rootfsSize + ${toString cfg.freeSpaceBytes} ))
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dtbStart=$(($rootfsStart + $rootfsSize))
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imageSize=$(binsize ${image})
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ln -s ${o.manifest} manifest
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ln -s ${image} image
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ln -s ${o.kernel} vmlinux # handy for gdb
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# if we are transferring kernel and dtb separately, the
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# dtb has to precede the kernel in ram, because zimage
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# decompression code will assume that any memory after the
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# end of the kernel is free
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dtbStart=$(($rootfsStart + $rootfsSize))
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${if cfg.compressRoot
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then ''
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lzma -z9cv ${o.rootfs} > rootfs.lz
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rootfsLzStart=$dtbStart
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rootfsLzSize=$(binsize rootfs.lz)
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dtbStart=$(($dtbStart + $rootfsLzSize))
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''
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else ''
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ln -s ${o.rootfs} rootfs
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''
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}
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cat ${o.dtb} > dtb
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address_cells=$(fdtget dtb / '#address-cells')
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size_cells=$(fdtget dtb / '#size-cells')
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@ -93,34 +120,41 @@ in {
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fdtput -p -t s dtb /reserved-memory/$node compatible phram
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fdtput -p -t lx dtb /reserved-memory/$node reg $ac_prefix $(hex $rootfsStart) $sz_prefix $(hex $rootfsSize)
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dtbSize=$(binsize ./dtb )
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imageStart=$(($dtbStart + $dtbSize))
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${if cfg.compressRoot
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then ''
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lzma -z9cv ${o.rootfs} > rootfs.lz
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rootfsLzStart=$(($imageStart + $imageSize))
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rootfsLzSize=$(binsize rootfs.lz)
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''
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else "ln -s ${o.rootfs} rootfs"
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}
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cmd="liminix ${cmdline} mtdparts=phram0:''${rootfsSize}(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsSize},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
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fdtput -t s dtb /chosen bootargs "$cmd"
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# dtc -I dtb -O dts -o /dev/stdout dtb | grep -A10 chosen ; exit 1
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dtbSize=$(binsize ./dtb )
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${if cfg.appendDTB then ''
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imageStart=$dtbStart
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# re-package image with updated dtb
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cat ${o.kernel} > vmlinux.elf
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${objcopy} --update-section .appended_dtb=dtb vmlinux.elf
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${stripAndZip}
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# TODO don't hardcode mips, entryPoint, loadAddress, name
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mkimage -A mips -O linux -T kernel -C lzma -a $(hex ${toString hw.loadAddress}) -e $(hex ${toString hw.entryPoint}) -n 'MIPS Liminix Linux' -d vmlinux.bin.lzma image
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# dtc -I dtb -O dts -o /dev/stdout dtb | grep -A10 chosen ; exit 1
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tftpcmd="tftpboot $(hex $imageStart) result/image "
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bootcmd="bootm $(hex $imageStart)"
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'' else ''
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imageStart=$(($dtbStart + $dtbSize))
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tftpcmd="tftpboot $(hex $imageStart) result/image; tftpboot $(hex $dtbStart) result/dtb "
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ln -s ${image} image
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bootcmd="${bootCommand} $(hex $imageStart) - $(hex $dtbStart)"
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''}
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cat > boot.scr << EOF
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setenv serverip ${cfg.serverip}
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setenv ipaddr ${cfg.ipaddr}
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tftpboot $(hex $imageStart) result/image ; ${
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${
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if cfg.compressRoot
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then "tftpboot $(hex $rootfsLzStart) result/rootfs.lz"
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else "tftpboot $(hex $rootfsStart) result/rootfs"
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}; tftpboot $(hex $dtbStart) result/dtb
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}; $tftpcmd
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${if cfg.compressRoot
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then "lzmadec $(hex $rootfsLzStart) $(hex $rootfsStart); "
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else ""
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} ${bootCommand} $(hex $imageStart) - $(hex $dtbStart)
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} $bootcmd
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EOF
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'';
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@ -12,7 +12,7 @@ let derivation = (import liminix {
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img = derivation.outputs.tftpboot;
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uboot = derivation.outputs.u-boot;
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pkgsBuild = derivation.pkgs.pkgsBuildBuild;
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in pkgsBuild.runCommand "check" {
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in pkgsBuild.runCommand "check-${deviceName}" {
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nativeBuildInputs = with pkgsBuild; [
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expect
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socat
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@ -44,4 +44,7 @@ in {
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mipsLz = check "qemu" {
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boot.tftp.compressRoot = true;
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};
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mipsOldUboot = check "qemu" {
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boot.tftp.appendDTB = true;
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};
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}
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