# GL-X750 - Spitz - right RTC chip for the router

**URL:** <https://forum.gl-inet.com/t/gl-x750-spitz-right-rtc-chip-for-the-router/8277>\
**Category:** Router\
**Created:** [September 19, 2019, 8:22pm UTC](https://forum.gl-inet.com/t/gl-x750-spitz-right-rtc-chip-for-the-router/8277 "2019-09-19T20:22:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Thor](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/t/8edcca/32.png) [@Thor](https://forum.gl-inet.com/u/Thor)\
**Post date:** [September 19, 2019, 8:22pm UTC](https://forum.gl-inet.com/t/gl-x750-spitz-right-rtc-chip-for-the-router/8277/1 "2019-09-19T20:22:21Z")

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Hi,  
there is a placeholder on the board for a RTC chip but which one is the right one?  
If i addon the correct RTC, then it usable or i need additional software?

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<div class="post-metadata">

**Author:** ![robotluo](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/robotluo/32/17434_2.png) [@robotluo](https://forum.gl-inet.com/u/robotluo)\
**Post date:** [September 20, 2019, 2:08am UTC](https://forum.gl-inet.com/t/gl-x750-spitz-right-rtc-chip-for-the-router/8277/2 "2019-09-20T02:08:40Z")

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RTC and bluetooth share GPIO1, do you have bluetooth on your device?  
Additional packages need to be installed to use RTC.

For SD2068, please excute following command:

```auto
opkg update
opkg install kmod-i2c-gpio-custom
opkg install kmod-rtc-sd2068
insmod /lib/modules/3.18.29/i2c-gpio-custom.ko bus0=0,1,17
echo sd2068 0x32 > /sys/bus/i2c/devices/i2c-0/new_device

```

Note that GPIO1 is held by default by bluetooth, and you need to recompile the firmware and add the following patches before using it

```auto
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-gl-x750.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-gl-x750.c
@@ -164,9 +164,9 @@ static void __init gl_x750_setup(void)
                          GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED,
                          "PCI power");
 
- gpio_request_one(GL_X750_GPIO_BLE_RST,
+ /*gpio_request_one(GL_X750_GPIO_BLE_RST,
                          GPIOF_OUT_INIT_LOW | GPIOF_EXPORT_DIR_FIXED,
- "BLE RST");
+ "BLE RST");*/
 
 // platform_device_register(&gl_x750_i2c_gpio);

```

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<div class="post-metadata">

**Author:** ![bruce](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/bruce/32/35649_2.png) [@bruce](https://forum.gl-inet.com/u/bruce)\
**Post date:** [October 29, 2025, 4:09am UTC](https://forum.gl-inet.com/t/gl-x750-spitz-right-rtc-chip-for-the-router/8277/3 "2025-10-29T04:09:02Z")

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