posix-h4-bcm: download firmware at higher speed

port/posix-h4-bcm/README.md

@@ -3,7 +3,7 @@
 ## Configuration
 Newer Infineon Airoc (tm) Controllers like the CYW5557x series accept PatchRAM upload only in a so-called
 'auto-baud mode' which is entered by asserting CTS (low) and starting/resetting the controller via BT_REG_EN.
-This port currently only supports the CYW5557x Controllers and slowly uploads the firmware at 115200.
+This port currently only supports the CYW5557x Controllers.
 
 ## Compilation
 
@@ -27,10 +27,15 @@ On start, BTstack opens the serial port, which asserts CTS, and requests you to
     2
     1
     Firmware download started
+    Local version information:
+    - HCI Version    0x000a
+    - HCI Revision   0x0b73
+    - LMP Version    0x000a
+    - LMP Subversion 0x2257
+    - Manufacturer 0x0009
     Phase 2: Main app
-    ...
     BTstack up and running at 55:56:0A:0A:76:93
+    ...
 
 ## ToDo
-- increase baud rate for firmware upload
-- query controller to select correct PatchRAM file
+- select PatchRAM file based on HCI Read Local Version Information

port/posix-h4-bcm/main.c

@@ -79,6 +79,8 @@ static char tlv_db_path[100];
 static const btstack_tlv_t * tlv_impl;
 static btstack_tlv_posix_t   tlv_context;
 
+static const uint32_t baudrate_firmware_download = 921600;
+
 static hci_transport_config_uart_t transport_config = {
     HCI_TRANSPORT_CONFIG_UART,
     115200,
@@ -177,7 +179,7 @@ int main(int argc, const char * argv[]){
     const btstack_uart_t * uart_driver = (const btstack_uart_t *) btstack_uart_posix_instance();
 
     // extract UART config from transport config
-    uart_config.baudrate    = transport_config.baudrate_init;
+    uart_config.baudrate    = baudrate_firmware_download;
     uart_config.flowcontrol = transport_config.flowcontrol;
     uart_config.device_name = transport_config.device_name;
     uart_driver->init(&uart_config);