fix(serial): limit throughput test max_size to 512

Reduce upload probe max_size from 4096 to 1024 to avoid triggering
UART DMA Bus Fault on BES O62 when buffer is near capacity.

Signed-off-by: VIFEX <vifextech@foxmail.com>

Author: FASTSHIFT

Tools/WebServer/core/serial_protocol.py

@@ -806,7 +806,7 @@ def _phase_fragment_probe(self, timeout: float = 2.0) -> Dict:
         return result
 
     def _phase_upload_probe(
-        self, start_size: int = 16, max_size: int = 4096, timeout: float = 2.0
+        self, start_size: int = 16, max_size: int = 512, timeout: float = 2.0
     ) -> Dict:
         """Phase 2: Find the device shell receive buffer limit (upload direction).
 
@@ -982,7 +982,7 @@ def _phase_download_probe(
         return result
 
     def test_serial_throughput(
-        self, start_size: int = 16, max_size: int = 4096, timeout: float = 2.0
+        self, start_size: int = 16, max_size: int = 512, timeout: float = 2.0
     ) -> Dict:
         """Test serial throughput with 3-phase probing.
 

Tools/WebServer/static/js/features/fpb.js

@@ -53,7 +53,7 @@ async function fpbTestSerial() {
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
         start_size: 16,
-        max_size: 4096,
+        max_size: 512,
         timeout: 2.0,
       }),
     });