Skip to main content

Hardware Errata

Collection of some notes on the rev1 coordinator hardware

Assembly

  • Combine 100nF capacitors on BoM
    • C804 (100V) and others (logic level) can be served by the same item
  • 0402 size for bottom indicator LEDs is ass
    • They ought to be larger, 0603 or 0805
    • Alternatively, use reverse-mount LEDs that are easier to work with (and can be reflowed)
  • Ethernet PHY is not recognized
    • Appears to just be a soldering issue with the pads on the SoM not making proper connection
    • Next rev should have larger SoM pads with more cream?
  • Fix footprint for C802, C803
    • They are actually 3225, not 3216

Operation

  • Wifi seems to be busted
    • This likely is a software issue; the module initializes correctly and is recognized on boot (with the appropriate drivers being loaded)
    • [   19.308901] mwifiex_sdio mmc0:0001:1: info: FW download over, size 616840 bytes
[   19.834461] mwifiex_sdio mmc0:0001:1: WLAN FW is active
[   20.254606] mwifiex_sdio mmc0:0001:1: info: MWIFIEX VERSION: mwifiex 1.0 (15.68.7.p189)
[   20.261290] mwifiex_sdio mmc0:0001:1: driver_version = mwifiex 1.0 (15.68.7.p189)
[   32.322732] fixed-3v3: disabling
[   32.324575] vdd_sd: disabling
[  317.632606] mwifiex_sdio mmc0:0001:1: Firmware wakeup failed
[  317.637160] mwifiex_sdio mmc0:0001:1: PREP_CMD: FW in reset state
[  317.653566] mwifiex_sdio mmc0:0001:1: info: shutdown mwifiex...
[  317.672972] mwifiex_sdio mmc0:0001:1: PREP_CMD: card is removed
[  317.775670] mwifiex_sdio mmc0:0001:1: WLAN FW already running! Skip FW dnld
[  317.781226] mwifiex_sdio mmc0:0001:1: WLAN FW is active
[  327.952520] mwifiex_sdio mmc0:0001:1: mwifiex_cmd_timeout_func: Timeout cmd id = 0xa9, act = 0x0
[  327.959898] mwifiex_sdio mmc0:0001:1: num_data_h2c_failure = 0
[  327.965752] mwifiex_sdio mmc0:0001:1: num_cmd_h2c_failure = 0
[  327.971442] mwifiex_sdio mmc0:0001:1: is_cmd_timedout = 1
[  327.976846] mwifiex_sdio mmc0:0001:1: num_tx_timeout = 0
[  327.982131] mwifiex_sdio mmc0:0001:1: last_cmd_index = 0
[  327.987447] mwifiex_sdio mmc0:0001:1: last_cmd_id: a9 00 28 00 16 00 cd 00 1e 00
[  327.994853] mwifiex_sdio mmc0:0001:1: last_cmd_act: 00 00 13 00 01 00 01 00 00 00
[  328.002295] mwifiex_sdio mmc0:0001:1: last_cmd_resp_index = 4
[  328.008046] mwifiex_sdio mmc0:0001:1: last_cmd_resp_id: df 80 28 80 16 80 cd 80 1e 80
[  328.015874] mwifiex_sdio mmc0:0001:1: last_event_index = 1
[  328.021326] mwifiex_sdio mmc0:0001:1: last_event: 00 00 0b 00 00 00 00 00 00 00
[  328.028643] mwifiex_sdio mmc0:0001:1: data_sent=1 cmd_sent=1
[  328.034285] mwifiex_sdio mmc0:0001:1: ps_mode=0 ps_state=0
[  328.043571] mwifiex_sdio mmc0:0001:1: info: _mwifiex_fw_dpc: unregister device
  • No pull-up on /RF_RESET line
    • This means that every time the SoC resets, the RF part also resets. A hardware pull-up prevents this when the GPIOs go tristate during reset
  • Ethernet port LEDs are ~ bright ~
    • Should be increased from 330Ω, they’re a little on the bright side. 1k is probably fine, as they needn’t be super bright
No Comments
Back to top