Configure QEMU for 16MB flash to match debug build

Updated QEMU flash configuration to support the new 16MB build:

Changes:
- run-qemu.sh: Changed flash size from 4MB to 16MB (count=16)
- Updated comment to clarify 16MB flash (0x1000000 bytes)
- Documentation: Added flash size note in QEMU-ISSUES.md

The esp32_16MB_V4_M_eth_debug build requires 16MB flash space.
QEMU now creates a 16MB flash image to accommodate this build.

Co-authored-by: softhack007 <[email protected]>

Author: Copilot

.github/scripts/run-qemu.sh

@@ -54,8 +54,8 @@ echo "HTTP will be accessible at: http://localhost:${HTTP_PORT}"
 FLASH_IMAGE="/tmp/wled_flash.bin"
 echo "Creating flash image at $FLASH_IMAGE"
 
-# Create a 4MB flash image (0x400000 bytes)
-dd if=/dev/zero of="$FLASH_IMAGE" bs=1M count=4 2>/dev/null
+# Create a 16MB flash image (0x1000000 bytes) for esp32_16MB_V4_M_eth_debug
+dd if=/dev/zero of="$FLASH_IMAGE" bs=1M count=16 2>/dev/null
 
 # Write bootloader at 0x1000
 if [ -f "$BOOTLOADER" ]; then

docs/QEMU-ISSUES.md

@@ -5,6 +5,7 @@
 **Important**: QEMU testing uses the **V4 Mainline ethernet debug build** (`esp32_16MB_V4_M_eth_debug`).
 
 ### Why esp32_16MB_V4_M_eth_debug Build?
+- **16MB Flash**: Provides sufficient space for all features and debugging symbols
 - WiFi hardware is not emulated in QEMU
 - WiFi initialization causes crashes in QEMU
 - Ethernet build uses `WLED_USE_ETHERNET` flag
@@ -14,6 +15,8 @@
 - HTTP server works via emulated ethernet (open_eth model)
 - Debug build provides better crash analysis capabilities
 
+**Flash Size Configuration**: The QEMU setup creates a 16MB flash image to match the build requirements. This is configured in `run-qemu.sh`.
+
 ### Ethernet Configuration for QEMU
 The build uses ESP32-POE board configuration (index 2):
 - **PHY Address**: 0