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Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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ESP32-S3 WiFi does not work if external SPIRAM is enabled #74246

Open EricNRS opened 2 weeks ago

EricNRS commented 2 weeks ago

Describe the bug If SPIRAM is enabled, WiFi does not work on ESP32S3 WROOM N16R8.

WiFi Works if SPIRAM is disabled: west build --pristine -b xiao_esp32s3/esp32s3/procpu samples/net/wifi -DCONFIG_ESP_SPIRAM=n && west flash && west espressif monitor

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x15 (USB_UART_CHIP_RESET),boot:0x28 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40048df9
SPIWP:0xee
mode:DIO, clock div:2
load:0x3fc94170,len:0x3804
load:0x40374000,len:0x1014c

SHA-256 comparison failed:
Calculated: 8923cad87525e34488aa27e9abb59530d31d7a56f3c68686442b1c27b70b23be
Expected: 0000000070c60000000000000000000000000000000000000000000000000000
Attempting to boot anyway...
entry 0x4037cdd8

I (94) boot: ESP Simple boot
I (94) boot: compile time Jun 14 2024 01:20:43
W (95) boot: Unicore bootloader
I (95) spi_flash: detected chip: gd
I (96) spi_flash: flash io: dio
W (99) spi_flash: Detected size(16384k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (111) boot: chip revision: v0.2
I (114) boot.esp32s3: Boot SPI Speed : 40MHz
I (118) boot.esp32s3: SPI Mode       : DIO
I (122) boot.esp32s3: SPI Flash Size : 8MB
I (126) boot: Enabling RNG early entropy source...
[esp32s3] [INF] DRAM: lma 0x00000020 vma 0x3fc94170 len 0x3804   (14340)
[esp32s3] [INF] IRAM: lma 0x0000382c vma 0x40374000 len 0x1014c  (65868)

[esp32s3] [INF] padd: lma 0x00013988 vma 0x00000000 len 0xc670   (50800)
[esp32s3] [INF] IMAP: lma 0x00020000 vma 0x42000000 len 0x53260  (340576)
0x42000000: _stext at ??:?

[esp32s3] [INF] padd: lma 0x00073268 vma 0x00000000 len 0xcd90   (52624)
[esp32s3] [INF] DMAP: lma 0x00080000 vma 0x3c060000 len 0x131ec  (78316)
[esp32s3] [INF] Image with 6 segments
[esp32s3] [INF] DROM segment: paddr=00080000h, vaddr=3c060000h, size=131F0h ( 78320) map
[esp32s3] [INF] IROM segment: paddr=00020000h, vaddr=42000000h, size=5325Eh (340574) map

*** Booting Zephyr OS build v3.6.0-5736-gd78a9429450f ***
uart:~$ wifi scan
Scan requested

Num  | SSID                             (len) | Chan (Band)   | RSSI | Security        | BSSID             | MFP     
1    | IoT                              3     | 1    (2.4GHz) | -67  | WPA2-PSK        |                   | Disable 
2    | IoT                              3     | 11   (2.4GHz) | -74  | WPA2-PSK        |                   | Disable 
3    | IoT                              3     | 6    (2.4GHz) | -87  | WPA2-PSK        |                   | Disable 
Scan request done
uart:~$

If SPIRAM is enabled, then WiFi returns nothing for wifi scan and will also not connect. I only have octal SPI devices, so I am unable to determine if this is just an octal SPI issue or it it applies to quad SPI as well.

west build --pristine -b xiao_esp32s3/esp32s3/procpu samples/net/wifi -DCONFIG_ESP_SPIRAM=y -DCONFIG_SPIRAM_MODE_OCT=y && west flash && west espressif monitor

I (97) boot: ESP Simple boot
I (97) boot: compile time Jun 14 2024 01:13:09
W (97) boot: Unicore bootloader
I (97) spi_flash: detected chip: gd
I (98) spi_flash: flash io: dio
W (101) spi_flash: Detected size(16384k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (114) boot: chip revision: v0.2
I (117) boot.esp32s3: Boot SPI Speed : 40MHz
I (121) boot.esp32s3: SPI Mode       : DIO
I (124) boot.esp32s3: SPI Flash Size : 8MB
I (128) boot: Enabling RNG early entropy source...
[esp32s3] [INF] DRAM: lma 0x00000020 vma 0x3fc94a30 len 0x3b1c   (15132)
[esp32s3] [INF] IRAM: lma 0x00003b44 vma 0x40374000 len 0x10a10  (68112)
[esp32s3] [INF] padd: lma 0x00014568 vma 0x00000000 len 0xba90   (47760)
[esp32s3] [INF] IMAP: lma 0x00020000 vma 0x42000000 len 0x53598  (341400)
[esp32s3] [INF] padd: lma 0x000735a0 vma 0x00000000 len 0xca58   (51800)
[esp32s3] [INF] DMAP: lma 0x00080000 vma 0x3c060000 len 0x1337c  (78716)
[esp32s3] [INF] Image with 6 segments
[esp32s3] [INF] DROM segment: paddr=00080000h, vaddr=3c060000h, size=13380h ( 78720) map
[esp32s3] [INF] IROM segment: paddr=00020000h, vaddr=42000000h, size=53596h (341398) map
I (202) octal_psram: vendor id    : 0x0d (AP)
I (202) octal_psram: dev id       : 0x02 (generation 3)
I (202) octal_psram: density      : 0x03 (64 Mbit)
I (204) octal_psram: good-die     : 0x01 (Pass)
I (209) octal_psram: Latency      : 0x01 (Fixed)
I (213) octal_psram: VCC          : 0x01 (3V)
I (217) octal_psram: SRF          : 0x01 (Fast Refresh)
I (222) octal_psram: BurstType    : 0x01 (Hybrid Wrap)
I (227) octal_psram: BurstLen     : 0x01 (32 Byte)
I (231) octal_psram: Readlatency  : 0x02 (10 cycles@Fixed)
I (237) octal_psram: DriveStrength: 0x00 (1/1)
I (241) esp_psram: Found 8MB PSRAM device
I (244) esp_psram: Speed: 40MHz
I (978) esp_psram: SPI SRAM memory test OK

*** Booting Zephyr OS build v3.6.0-5736-gd78a9429450f ***
uart:~$ wifi scan
Scan requested
*** SHOULD BE A LIST OF ACCESS POINTS HERE ***
Scan request done
uart:~$

To Reproduce Steps to reproduce the behavior:

  1. Use an ESP32S3 WROOM N16R8
  2. Build with SPIRAM enabled: west build --pristine -b xiao_esp32s3/esp32s3/procpu samples/net/wifi -DCONFIG_ESP_SPIRAM=y -DCONFIG_SPIRAM_MODE_OCT=y && west flash && west espressif monitor
  3. Do a "wifi scan" command
  4. See that no access points are found. In addition, WiFi will not connect to any known access points

Expected behavior WiFi scan finds access points and allows connecting.

Impact Complete failure of WiFi

Environment (please complete the following information): Zephyr 3.6.99 main @ d78a9429450f89de7829c8af7efe41fdb692fd50

EricNRS commented 2 weeks ago

Doing a bit more debugging, the issue is that the ESP32-S3 WiFi stack does not support buffers allocated in SPIRAM and the minimum heap size of 51200 is too small, so the heap manager starts allocating out of SPIRAM.

*** Booting Zephyr OS build v3.6.0-5736-gd78a9429450f ***
uart:~$ kernel heap
free:           12
allocated:      50904
max. allocated: 50904

Increasing the heap size to 100KB allows the scan to work and shows that the maximum heap usage is 83400 bytes.

uart:~$ kernel heap 
free:           21068
allocated:      80892
max. allocated: 83400

The HEAP_MEM_POOL_ADD_SIZE_BOARD should be increased to 86016 or similar to allow WiFi to work.

However, this increased memory requirement makes the ESP32-S3 target very difficult to use since the internal SRAM is already in short supply with just this example already using 73% of the available memory. Is there any chance that the ESP32-S3 WiFi stack could be fixed to support using buffers from SPIRAM? That has been a long-term issue.

Memory region         Used Size  Region Size  %age Used
           FLASH:      603244 B    8388352 B      7.19%
     iram0_0_seg:       68148 B       329 KB     20.23%
     dram0_0_seg:      234376 B       313 KB     73.13%
     irom0_0_seg:      341706 B         8 MB      4.07%
     drom0_0_seg:      472172 B         8 MB      5.63%
     ext_ram_seg:       1536 KB    8388544 B     18.75%
    rtc_iram_seg:          0 GB         8 KB      0.00%
    rtc_data_seg:          0 GB         8 KB      0.00%
    rtc_slow_seg:          0 GB         8 KB      0.00%
        IDT_LIST:          0 GB         8 KB      0.00%
EricNRS commented 2 weeks ago

@sylvioalves