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pureboot: every libavr chip — 37 loaders, the m48 class, the 644 geometry

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The chip table becomes family blocks covering all 37 targets. The m48s
are a new deployment class: no boot section, so the tiny profile spoken
over the hardware USART — host-patched reset vector, trampoline
hand-over, a 510-byte budget (474 B built), no fuse preflight — while
their RWWSRE store stays the buffer discard (Atmel-8271 §26.2); the
device keys the patch flag and the CPU-halt waits on the curated
boot-section capability and the discard on the RWWSRE bit itself. The
644s' 64 KiB is exactly the 16-bit byte space: plain LPM, byte wire
addresses, 498 B in a 512-byte slot — and their 1 KiB minimum boot
section holds the resident and staging slots together, so self-update
needs no fuse step (the update test's slot pick now keys word-flash on
base >= 64 KiB; base + slot merely touching the boundary stays
byte-addressed). The 1284 joins the 1284P's word-addressed 1 KiB slot at
558 B. BOOT_FUSE gains every boot-sectioned family's ladder and fuse
byte; the planner exercises them all. The sim scaffolding keys
patch-vector-ness instead of the atmega name prefix, the fixture app
picks its clock by family (the tiny25/45/13 builds surfaced the 16 MHz
fallthrough as garbled banners), and the runner's wrapped flash ioctl
performs the m48 discard simavr's no-RWW cores turn into a stray buffer
fill. Sizes across the fleet: 466-504 B megas, 474 B m48s, 498 B 644s,
488-502 B tinies, 558 B 1284s — every chip passing
size/pi/planner/protocol/reloc/update.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-07-21 18:53:04 +02:00
parent b7d082ff11
commit 9cbe2d682d
11 changed files with 2059 additions and 661 deletions
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8
test/pbapp.cpp
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@@ -17,17 +17,17 @@ namespace {
consteval avr::hertz_t clock()
{
if (avr::hw::db.name == "ATtiny13A")
auto name = std::string_view{avr::hw::db.name};
if (name.starts_with("ATtiny13"))
return 9.6_MHz;
if (avr::hw::db.name == "ATtiny85")
if (name.starts_with("ATtiny"))
return 8_MHz;
return 16_MHz;
}
using dev = avr::device<{.clock = clock()}>;
template <avr::hertz_t C,
bool Hardware = avr::hw::db.has_instance("USART0") || avr::hw::db.has_instance("USART")>
template <avr::hertz_t C, bool Hardware = avr::hw::db.has_instance("USART0") || avr::hw::db.has_instance("USART")>
struct link {
using tx_t = avr::uart::usart0<C, {.baud = 115200_Bd, .max_baud_error = 2.5_pct}>;
static void tx(char c)