Differences

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--- t1600g-52ps [2021/03/03 14:57] – andyboeh
+++ t1600g-52ps [2022/09/04 20:18] (current) – andyboeh
@@ Line 1: / Line 1: @@
 ====== TP-Link T1600G-52PS v4 ======
-The TP-Link T1600G-52PS v4 48 + 4-port Gigabit L2 switch with PoE+.
+The TP-Link T1600G-52PS v4 48 + 4-port Gigabit L2 switch with PoE+, also called TL-SG2452P.
 Note: the v4 (and possibly v3) boards in this series are RTL83xx-based. However v1 is based on the Broadcom BCM53344/BCM53346 chipset.
-** ATTENTION: Currently, no development is being made for this device **
 ===== Hardware =====
@@ Line 40: / Line 38: @@
 ==== OpenWrt Support ====
-OpenWrt support is currently WiP. There is serial access to the bootloader and the stock firmware image has been successfully decrypted. However, a new U-Boot is required for development.
+OpenWrt support is currently WiP. There is serial access to the bootloader and the stock firmware image has been successfully decrypted. However, a new U-Boot is recommended for development. Otherwise, initramfs images can only be flashed by grounding the CLK pin of the flash chip at the right time during boot.
 It might be possible to have upgrades from the stock web interface, but this depends on whether the RSA signature is actually verified or not - the relevant code is commented in the bootloader source code.
@@ Line 51: / Line 49: @@
   * ''%%make O=t1600g-52ps-v4 tplink-t1600g-52ps-v4_defconfig%%''
   * ''%%make O=t1600g-52ps-v4%%''
-  * u-boot.bin is at `tplink-t1600g-52ps-v4/images/u-boot.bin`
+  * u-boot.bin is at ''%%tplink-t1600g-52ps-v4/images/u-boot.bin%%''
-There is no need to change anything in the source code, as debug is enabled by default. To flash it, a SOIC-16 clip and flashing tool is required - a cheap WCH340-based SPI flasher works sufficiently.
+There is no need to change anything in the source code, as debug is enabled by default. To flash it, a SOIC-16 clip and flashing tool is required - a cheap WCH340-based SPI flasher works sufficiently:
-==== GPIO mapping ====
+<code>
+Read Flash:
-So far, a rather complete GPIO mapping has been found, but some GPIOs cannot be toggled from within OpenWrt. Since the cause is yet unknown, it is not possible to control the fan or LEDs.
+sudo flashrom -p ch341a_spi -r backup_t1600g.bin
-^ GPIO ^ Direction ^ Purpose ^
+Create new U-Boot:
-| 15 | Out | PoE Reset (500ms Low) |
-| 31 | In | Probably Fan RPM Input |
-| 20 | Out | System Fan RPM Input |
-| 22 | In | Power Supply Fan 1 RPM Input |
-| 23 | Out | Fan Green LED |
-| 8 | Out | Fan Orange LED |
-| 11 | In | Button PoE/Speed |
-| 12 | In | Button Reset |
-| 16 | Out | Speed Green LED |
-| 17 | Out | PoE Green LED |
-| 10 | Out | PoE Max Green LED |
-| 28 | Out | Fan Speed Out |
-| 19 | Out | Fan Speed Out |
-| 18 | Out | Fan Speed Out |
-and 26 are probably SDA/SCL for PoE, but this is not yet confirmed.
+truncate -s 32M u-boot_new.bin
+Flash only U-Boot:
+sudo flashrom -p ch341a_spi -l t1600g_layout.map -i boot -w u-boot_new.bin
+</code>
+The map file looks like this:
+<code>
+00000000:000DFFFF boot
+E0000:000FFFFF env
+00100000:006FFFFF sys
+00700000:010FFFFF usrimg1
+01100000:01AFFFFF usrimg2
+B00000:01EFFFFF usrappfs
+F00000:01FFFFFF para
+</code>
 ==== Fan Control ====
-The fan control was measured, but can't be replicated since toggling these GPIOs does not work from within OpenWrt:
+The fan control was measured, but not all required GPIOs could be found. Only Full speed and medium speed are possible so far.
+==== Workarounds ====
+Until proper kernel driver support comes up, PoE support and LED support need some hacks:
+===== LEDs =====
+The following commands enable the port LEDs in automatic mode:
+<code>
+cd /sys/kernel/debug/rtl838x/led
+echo 0x0060f568 > led_glb_ctrl
+echo 0x00007dea > led_set_0_1
+echo 0xffffffff > led_copr_pmask_ctrl_0
+echo 0x000fffff > led_copr_pmask_ctrl_1
+echo 0xffffffff > led_combo_ctrl_0
+echo 0x000fffff > led_combo_ctrl_1
+</code>
+===== PoE =====
-  * Low - Low - Low = Full Speed
+The PoE modules and the kernel hwmon driver work, but the ICs are not in the correct mode during startup. In order to enable them, the package `i2c-tools` needs to installed and a startup script is required:
-  * Low - High - High = Medium
-  * High - High - High = Low Speed
+<code>
+i2cset -y 0 0x30 0x12 0xff
+for i in `seq 3 14`; do
+echo 1 > /sys/class/hwmon/hwmon$i/in0_enable
+echo 1 > /sys/class/hwmon/hwmon$i/in1_enable
+echo 1 > /sys/class/hwmon/hwmon$i/in2_enable
+echo 1 > /sys/class/hwmon/hwmon$i/in3_enable
+done
+</code>
 ===== References =====
   * [[https://www.tp-link.com/us/business-networking/smart-switch/t1600g-52ps/ | Product page]]
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