diff --git a/src/asahi/lib/agx_chip.c b/src/asahi/lib/agx_chip.c
index da139589e67c..a01f72d39df7 100644
--- a/src/asahi/lib/agx_chip.c
+++ b/src/asahi/lib/agx_chip.c
@@ -276,6 +276,28 @@ agx_chip_driver_supported(enum agx_chip chip)
    }
 }
 
+/* Measured J514M/T6034 G15C B1: four ten-slot clusters with 30 fused cores.
+ * Keep this separate from the existing T6031 contract. Every consumer uses
+ * the supplied masks; a different revision or topology needs its own evidence.
+ */
+static bool
+agx_params_t6034_supported(const struct drm_asahi_params_global *params)
+{
+   if (params->chip_id != 0x6034 || params->gpu_revision != 0x11 ||
+       params->num_cores_per_cluster != 10)
+      return false;
+
+   unsigned enabled = 0;
+   for (unsigned i = 0; i < 4; ++i) {
+      uint64_t mask = params->core_masks[i];
+      if (!mask || (mask & ~UINT64_C(0x3ff)))
+         return false;
+      for (; mask; mask &= mask - 1)
+         ++enabled;
+   }
+   return enabled == 30;
+}
+
 bool
 agx_params_driver_supported(const struct drm_asahi_params_global *params)
 {
@@ -316,10 +338,11 @@ agx_params_driver_supported(const struct drm_asahi_params_global *params)
              params->usc_generation == AGX_ISA_AGX3 &&
              params->gpu_hal_generation == DRM_ASAHI_GPU_HAL_LEGACY;
    case AGX_CHIP_G15C:
-      /* T6031/M3 Max: the same generation as T6030 with four clusters.
-       * Binned parts differ only in their core masks, which every consumer
-       * reads from the parameters, so the masks are not part of the check. */
-      return params->chip_id == 0x6031 && params->num_dies == 1 &&
+      /* T6031 and the measured 30-core T6034 use the four-cluster G15C
+       * contract. T6034 additionally requires its measured revision and
+       * fused topology; the existing T6031 admission is unchanged. */
+      return (params->chip_id == 0x6031 || agx_params_t6034_supported(params)) &&
+             params->num_dies == 1 &&
              params->num_clusters_total == 4 &&
              params->usc_generation == AGX_ISA_AGX3 &&
              params->gpu_hal_generation == DRM_ASAHI_GPU_HAL_LEGACY;
diff --git a/src/asahi/lib/agx_device.c b/src/asahi/lib/agx_device.c
index b24942a8ebae..1d55f45f4cb7 100644
--- a/src/asahi/lib/agx_device.c
+++ b/src/asahi/lib/agx_device.c
@@ -976,7 +976,7 @@ agx_open_device(void *memctx, struct agx_device *dev)
          fprintf(stderr,
                  "Apple G15C kernel parameters do not match this driver "
                  "(chip %#x, %u dies, %u clusters, USC %u, HAL %u; expected "
-                 "chip 0x6031, 1 die, 4 clusters, USC 3, HAL 0)\n",
+                 "chip 0x6031 or 30-core T6034 B1, 1 die, 4 clusters, USC 3, HAL 0)\n",
                  dev->params.chip_id, dev->params.num_dies,
                  dev->params.num_clusters_total, dev->params.usc_generation,
                  dev->params.gpu_hal_generation);
diff --git a/src/asahi/lib/tests/test-chip-admission.c b/src/asahi/lib/tests/test-chip-admission.c
index 532be1c49646..ca465fe45c73 100644
--- a/src/asahi/lib/tests/test-chip-admission.c
+++ b/src/asahi/lib/tests/test-chip-admission.c
@@ -119,6 +119,39 @@ main(void)
    bad.num_clusters_total = 4;
    assert(!agx_params_driver_supported(&bad));
 
+   /* Fresh J514M/T6034 identity: four physical clusters, 30 enabled cores. */
+   struct drm_asahi_params_global t6034 = g15_params('C', 0x6034, 4);
+   t6034.gpu_revision = 0x11;
+   t6034.core_masks[0] = t6034.core_masks[1] = 0x1fd;
+   t6034.core_masks[2] = t6034.core_masks[3] = 0x1ed;
+   assert(agx_params_driver_supported(&t6034));
+   bad = t6034; bad.chip_id = 0x6032;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.gpu_revision = 0x12;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.num_cores_per_cluster = 8;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.num_clusters_total = 3;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.num_dies = 2;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.usc_generation = 2;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.gpu_hal_generation = DRM_ASAHI_GPU_HAL_200;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.core_masks[0] |= UINT64_C(1) << 10;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.core_masks[0] = 0;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.core_masks[0] ^= 1;
+   assert(!agx_params_driver_supported(&bad));
+   bad = t6034; bad.core_masks[0] |= 2;
+   assert(!agx_params_driver_supported(&bad));
+   assert(!agx_params_native_kernel_abi_supported(&t6034));
+   t6034.features = DRM_ASAHI_FEATURE_PER_COMMAND_INPUT_SYNCS |
+                    DRM_ASAHI_FEATURE_EXACT_PRIOR_BARRIERS;
+   assert(agx_params_native_kernel_abi_supported(&t6034));
+
    /* The same GPU identity must not admit the incompatible legacy payloads. */
    assert(!agx_params_native_kernel_abi_supported(NULL));
    assert(!agx_params_native_kernel_abi_supported(&g15s));