diff --git a/patch_v2/meow_audiod/meow_audiod b/patch_v2/meow_audiod/meow_audiod
index ce77121..d278a87 100755
Binary files a/patch_v2/meow_audiod/meow_audiod and b/patch_v2/meow_audiod/meow_audiod differ
diff --git a/patch_v2/meow_audiod/meow_audiod.c b/patch_v2/meow_audiod/meow_audiod.c
index 4858f3b..bd29c53 100644
--- a/patch_v2/meow_audiod/meow_audiod.c
+++ b/patch_v2/meow_audiod/meow_audiod.c
@@ -676,6 +676,12 @@ static int alsa_hw_params(int fd, unsigned rate, unsigned ch, unsigned fmt)
     memset(sm, 0, sizeof *sm); pmask(sm, SNDRV_PCM_SUBFORMAT_STD);
     pivset(&p.intervals[SNDRV_PCM_HW_PARAM_CHANNELS - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL], ch);
     pivset(&p.intervals[SNDRV_PCM_HW_PARAM_RATE - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL], rate);
+    /* M2.94 长流停摆根治（真机实证 60s 零 stall）：显式收窄周期几何到 tiny_alsa 惯例
+     * period=1024 frames × 4。否则驱动默认 buffer 巨大（上限 1048576 帧 ≈23s），
+     * hbc3000 桥靠周期中断驱动，中断稀缺 → 桥时钟域 wedge → 播 12s 左右停摆。
+     * （tonepcm2 几何矩阵实测：1024×4 连续 60s 实时消费零 stall。） */
+    pivset(&p.intervals[SNDRV_PCM_HW_PARAM_PERIOD_SIZE - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL], 1024);
+    pivset(&p.intervals[SNDRV_PCM_HW_PARAM_PERIODS - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL], 4);
     p.rmask = ~0u; p.info = 0; p.msbits = 0; p.rate_num = 0; p.rate_den = 0;
     return ioctl(fd, SNDRV_PCM_IOCTL_HW_PARAMS, &p);
 }
diff --git a/patch_v2/tools/tonepcm2.c b/patch_v2/tools/tonepcm2.c
index 0972865..81a8e21 100644
--- a/patch_v2/tools/tonepcm2.c
+++ b/patch_v2/tools/tonepcm2.c
@@ -86,6 +86,17 @@ int main(int argc, char **argv)
     iv->min = iv->max = 2; iv->integer = 1;
     iv = &p.intervals[SNDRV_PCM_HW_PARAM_RATE - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
     iv->min = iv->max = 44100; iv->integer = 1;
+    {   /* 几何收窄：TPCM_PERIOD/TPCM_BCOUNT 环境变量（默认 1024x4，对齐 tinyalsa 惯例） */
+        unsigned ps = 1024, bc = 4;
+        const char *e;
+        if ((e = getenv("TPCM_PERIOD"))) ps = (unsigned)atoi(e);
+        if ((e = getenv("TPCM_BCOUNT"))) bc = (unsigned)atoi(e);
+        struct snd_interval *iv2 = &p.intervals[SNDRV_PCM_HW_PARAM_PERIOD_SIZE - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
+        iv2->min = iv2->max = ps; iv2->integer = 1;
+        iv2 = &p.intervals[SNDRV_PCM_HW_PARAM_PERIODS - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
+        iv2->min = iv2->max = bc; iv2->integer = 1;
+        printf("geometry: period=%u count=%u\n", ps, bc);
+    }
     if (ioctl(fd, SNDRV_PCM_IOCTL_HW_REFINE, &p) != 0) { printf("REFINE2 fail\n"); close(fd); return 1; }
     if (getenv("PROBE_ONLY")) { printf("PROBE_ONLY: stop before PARAMS/write\n"); close(fd); return 0; }
     if (ioctl(fd, SNDRV_PCM_IOCTL_HW_PARAMS, &p) != 0) { printf("HW_PARAMS fail\n"); close(fd); return 1; }
diff --git a/scripts/build/fw_content.conf b/scripts/build/fw_content.conf
index 38f0db1..f5296a6 100644
--- a/scripts/build/fw_content.conf
+++ b/scripts/build/fw_content.conf
@@ -38,7 +38,7 @@ patch_v2/meow_svc_power/meow_svc_power|/usr/bin/meow_svc_power|39ae3aa255695a97f
 patch_v2/meow_verify/meow_verify|/usr/bin/meow_verify|6c2e8ed24aebe5caf41e7aed391312d5|II期验签 2B（多公钥+v2签名块 agent-221）
 patch_v2/meow_crash/meow_crash|/usr/bin/meow_crash|62781084445e82351bcadbdadbe4c7fc|系统级崩溃捕获 (agent-187)
 patch_v2/meow_svc_perf/meow_svc_perf|/usr/bin/meow_svc_perf|7ea196de9d59ab8cbd1e26edb7762772|性能专项服务 M2.75（net_json 补 network 闭合括号，修 /api/system JSON 解析失败）
-patch_v2/meow_audiod/meow_audiod|/usr/bin/meow_audiod|86a8b6793d516c90bbd12c2997b30d8f|独占音频守护 M2.91（+开机武装 hbc3000 FPGA 根治 PCM 启动死锁；+长流防卡死护栏 §12：ring有界写/ALSA poll自愈/popen有界收割/tx丢弃/watchdog）
+patch_v2/meow_audiod/meow_audiod|/usr/bin/meow_audiod|1c1712c6a2fd8a65009330ca901f33eb|独占音频守护 M2.94（+period=1024×4 几何收窄, 根治长流停摆）
 patch_v2/meow_audiod/meow_audio|/usr/bin/meow_audio|c23b96490842f54324b855fd9c2467a5|audiod 用户侧 CLI（status/tone/route/vol；connect/write 全有界 2s 超时）
 
 # ---- 开机 init 脚本（etc/init.d，数字决定启动顺序，按文件名自然序）----