Pinout alternative functions with SoC pin descriptions
I went over the freshly released schematics and for each pin header pin included the SoC pin name. Pin 11 is a bit strange - it is connected via 9J3 jumper to HDMI_CEC or totally unconnected if the jumper is connected on the other 2 pins.
As S805X datasheet has not been published then the next best thing is that most of the GPIOXX_XX names can be crossreferenced from S905X datasheet that is available from: http://www.mediafire.com/file/5bpt054va5ut7v9/S905X_Datasheet_V0.3_20170314publicversion-Wesion.pdf
As S805X datasheet has not been published then the next best thing is that most of the GPIOXX_XX names can be crossreferenced from S905X datasheet that is available from: http://www.mediafire.com/file/5bpt054va5ut7v9/S905X_Datasheet_V0.3_20170314publicversion-Wesion.pdf
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| PIN NAME | PIN DESCRIPTION | PIN NR | PIN NAME | PIN DESCRIPTION |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| 3.3V | | 1 | 2 | 5V | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| Linux_RX | GPIOAO_1 (UART_RX_AO_A // UART_RX_AO_B) | 3 | 4 | 5V | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| Linux_TX | GPIOAO_0 (UART_TX_AO_A // UART_TX_AO_B) | 5 | 6 | GND | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| TCK | GPIOH_6 (JTAG_TCK // TSin_CLK_B) | 7 | 8 | BT_EN | GPIOX_12 (UART_TX_A (long fifo) // SLIP_UART_TX) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| GND | | 9 | 10 | BT_WAKE_HOST | GPIOX_13 (UART_RX_A // SLIP_UART_RX) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| PWM / HDMI_CEC | GPIOAO_8 (AO_CEC // EE_CEC // PWM_AO_A) | 11 | 12 | TMS | GPIOH_7 (JTAG_TMS // TSin_D0_B) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| SPDIF-OUT | GPIOH_4 (SPDIF_OUT // SPDIF_IN) | 13 | 14 | GND | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| MUTE | GPIOH_5 | 15 | 16 | TDI | GPIOH_8 (JTAG_TDI // TSin_SOP_B) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| 3.3V | | 17 | 18 | TDO | GPIOH_9 (JTAG_TDO // TSin_D_VALID_B) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| UART_C_TX | GPIOX_8 (PCM_OUT_A // UART_TX_C // SPI_MOSI) | 19 | 20 | GND | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| UART_C_RX | GPIOX_9 (PCM_IN_A // UART_RX_C // SPI_MISO) | 21 | 22 | WIFI_D0 | GPIOX_0 (SDIO_D0) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| UART_C_RTS_N | GPIOX_11 (PCM_CLK_A // UART_RTS_C // SPI_SCLK) | 23 | 24 | UART_C_CTS_N | GPIOX_10 (PCM_FS_A // UART_CTS_C // SPI_SS0) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| GND | | 25 | 26 | WIFI_D1 | GPIOX_1 (SDIO_D1) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| I2C_SDA_A | GPIODV_24 (UART_TX_B // I2C_SDA_A // DMIC_IN) | 27 | 28 | I2C_SCK_A | GPIODV_25 (UART_RX_B // I2C_SCK_A // DMIC_CLK_OUT) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| SYS_LED | GPIODV_27 | 29 | 30 | GND | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| PWR_KEY_DET | GPIOAO_2 | 31 | 32 | WIFI_32K | GPIOX_16 (PWM_E) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| WIFI_PWREN | GPIOX_6 (PWM_A) | 33 | 34 | GND | |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| WIFI_WAKE_HOST | GPIOX_7 (SDIO_IRQ // PWM_F) | 35 | 36 | WIFI_D2 | GPIOX_2 (SDIO_D2) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| WIFI_CMD | GPIOX_5 (SDIO_CMD) | 37 | 38 | WIFI_D3 | GPIOX_3 (SDIO_D3) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
| GND | | 39 | 40 | WIFI_SD_CLK | GPIOX_4 (SDIO_CLK) |
+----------------+------------------------------------------------+----+----+--------------+----------------------------------------------------+
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