Eureka Kernel R24U v1.2 — ASV Margin + Baseband Guard

Eureka Kernel R24U — v1.2 (ASV Margin + Baseband Guard)

Same proven recipe as v1.1 (vendor R24U 4.4.302 + rsuntk KernelSU 32473,
original AROMA packaging, Neutron Clang 24, vendor flag style), now with the
two ROADMAP features that needed kernel code:

What's new in v1.2

• ASV voltage margin (ROADMAP §1) — runtime per-domain voltage margins:
  • /sys/class/asv_margin/{cpucl0,cpucl1,g3d,mif,int}/margin (µV, rw)
  • 0 = stock ECT table; positive = stability margin; negative = undervolt
    (user risk); clamped ±100000 µV; min/max exposed read-only
  • Implemented via the existing cal_dfs_set_volt_margin() → ACPM
    MARGIN_REQ path — the ACPM firmware applies it live to every future
    voltage transition. The vendor kernel only used this control at boot
    (fvmap early params); no runtime interface existed before.
  • Device-verified: margin round-trip 0→25000→0 µV on all domains.
• Baseband guard (ROADMAP §2) — CP auto-recovery policy:
  • hooks the modem event notifier; if the Shannon CP crashes and does not
    reach ONLINE within 45s, replays the RIL recovery sequence
    (modem_off → modem_on → boot_on); rate-limited to 3 attempts
  • sysfs: /sys/class/baseband_guard/baseband_guard/ — enable (default on),
    state, crashes, recoveries, last_event, boot_window_ms,
    max_attempts, reboot_on_dead (default off)
  • Device-verified: boots, cp_state=ONLINE, crash counter caught real
    CP events the vendor kernel silently swallowed, zero spurious recoveries.
• Includes everything from v1.1 (CIFS SMB2/3.1.1, full IPset) and the v1.1
  packaging fix (original Eureka DTBs via AROMA — see v1.1 notes).

Companion app

Eureka-Manager — kernel
manager with ASV-margin seekbars and a Baseband Guard dashboard (requires
this kernel).

Install

Flash in recovery → Default Installation → AOSP Q/R/S/T/U (New) →
SELinux Enforcing → DM-verity Yes → reboot.

Manager pairing

rsuntk RKSU manager ≥ v3.2.2-10-legacy (unchanged).

Per-device

Device	Codename	DTBO	v1.2 Image
Galaxy A10	a10	patched	28,458,096 B
Galaxy A20	a20	patched	29,097,448 B
Galaxy A20e	a20e	patched	28,722,792 B
Galaxy A30	a30	patched	29,443,944 B
Galaxy A30s	a30s	patched	user-verified boot + ASV + guard
Galaxy A40	a40	patched	29,796,840 B
Galaxy M20	m20	original (no device dtbo)	18,145,864 B
Galaxy M30s	jackpotlte	original (no device dtbo)	22,293,960 B

uname -r: 4.4.302-p6-Eureka-R24U-KSU_R24U (uniform, all 8)

ASV margin quick start

# +25 mV on the BIG cluster:
echo 25000 > /sys/class/asv_margin/cpucl0/margin
# back to stock:
echo 0 > /sys/class/asv_margin/cpucl0/margin

Negative values undervolt. Instability = your sign to go back toward 0.

Sources: R24U branch @ 8724e15af (asv_margin + baseband_guard commits).