gbos.git/tools/netboot, branch master

net: DHCP client - lease the IP at boot instead of hardcoding it

2026-07-17T12:11:22Z

The address is no longer baked in. net_init starts at 0.0.0.0; a DHCP client runs as the first thing on boot (init/shell forks it and waits), and only once it has a lease (or gives up) does the prompt appear. Kernel: - IP is configurable: 0.0.0.0 until leased; NET_SETIP op stores it. - 16-bit frame length. DHCP/BOOTP packets are ~272 bytes, over the old 255-byte frame cap, so net_slip_send takes a 16-bit length, net_pump assembles into a 320-byte buffer with a 16-bit wNetRxLen, and udp_send writes a 16-bit IP total. Payloads stay <=255 (kept small on purpose) so the per-protocol datalen math is unchanged. wNetTx/wNetRxBuf 256->320, SK_RXBUF 208->288. Userland: - c/dhcp.c: DISCOVER->OFFER->REQUEST->ACK over a UDP socket, then net_setip(); times out gracefully (shell still boots) if there's no server. sh.c runs it before the prompt. Bridge (self-contained DHCP server, no dnsmasq): - tunbridge.py + netboot intercept UDP->:67 and answer OFFER/ACK leasing 10.0.0.2 (gateway 10.0.0.1); everything else is bridged/NATed as before. Regression-tested ICMP/UDP/TCP after the 16-bit change. Verified end to end: dhcp: discovering dhcp: leased 10.0.0.2 /# ping 10.0.0.1 -> 4/4 (traffic from the leased address)

net: keep network packets out of the console (fixes shell garbage on netboot)

2026-07-17T11:29:42Z

The link port is both the console-input fallback and the network. At the shell prompt the host's multicast (mDNS/LLMNR/IGMP) was fed to the serial and KGetc read those packet bytes as console input -> garbage in the shell, OSK unusable. Two-part fix: - KGetc now skips SLIP frames (0xC0-delimited) on the serial console path, so inbound packets never surface as console input. Plain injected bytes (the headless tunbridge command path) still pass through. New wConInSkip flag. - netboot/tunbridge only forward IP packets destined to 10.0.0.2 (drop the multicast noise at the bridge). Verified: GB sits at a clean "/#" prompt while all packets (noise included) are forwarded; being-pinged (3/3) and wget still work. On the emulator, the OSK is SELECT=space, START=enter, A=z, B=x, d-pad=WASD/arrows.

tools: netboot - interactive networked emulator (TUN + NAT + --serial-sock)

2026-07-17T11:22:01Z

Brings up gbtun0 (10.0.0.1/24) + NAT, then launches sl0pboy with your own args and the link port bridged to the TUN over a unix socket (the emulator's new --serial-sock). Unlike headless tunbridge, the LCD + on-screen keyboard stay live, so it's a fully interactive networked Game Boy: the OSK is the console, the link port is the network. sudo tools/netboot --sixel --chrome gbos.gb # on the GB: SELECT for the OSK, then type: wget example.com / ping 1.1.1.1 GB is 10.0.0.2, host is 10.0.0.1. Requires /dev/net/tun + root. Ctrl-C or quit the emulator to tear down. tunbridge stays for headless scripted runs.