From 698d0dbda8a4b081103b4a382baa1f99e3f77ceb Mon Sep 17 00:00:00 2001
From: fauxpark <fauxpark@gmail.com>
Date: Wed, 11 Dec 2019 12:26:40 +1100
Subject: Use `clock_prescale_set()` from avr-libc (#7540)

* Use `clock_prescale_set()` from avr-libc

* Remove outdated FAQ info
---
 docs/zh-cn/faq_build.md | 15 ---------------
 1 file changed, 15 deletions(-)

(limited to 'docs/zh-cn/faq_build.md')

diff --git a/docs/zh-cn/faq_build.md b/docs/zh-cn/faq_build.md
index 8fb449db30..2f33fbca97 100644
--- a/docs/zh-cn/faq_build.md
+++ b/docs/zh-cn/faq_build.md
@@ -81,21 +81,6 @@ https://github.com/tmk/tmk_keyboard/issues/212
 https://github.com/tmk/tmk_keyboard/wiki/mbed-cortex-porting#compile-error-cstddef
 https://developer.mbed.org/forum/mbed/topic/5205/
 
-## `clock_prescale_set` and `clock_div_1` Not Available
-你的工具链太旧了不支持MCU。比如WinAVR 20100110就不支持ATMega32u2.
-
-```
-Compiling C: ../../tmk_core/protocol/lufa/lufa.c
-avr-gcc -c -mmcu=atmega32u2 -gdwarf-2 -DF_CPU=16000000UL -DINTERRUPT_CONTROL_ENDPOINT -DBOOTLOADER_SIZE=4096 -DF_USB=16000000UL -DARCH=ARCH_AVR8 -DUSB_DEVICE_ONLY -DUSE_FLASH_DESCRIPTORS -DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)" -DFIXED_CONTROL_ENDPOINT_SIZE=8  -DFIXED_NUM_CONFIGURATIONS=1 -DPROTOCOL_LUFA -DEXTRAKEY_ENABLE -DCONSOLE_ENABLE -DCOMMAND_ENABLE -DVERSION=unknown -Os -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -fno-inline-small-functions -fpack-struct -fshort-enums -fno-strict-aliasing -Wall -Wstrict-prototypes -Wa,-adhlns=obj_alps64/protocol/lufa/lufa.lst -I. -I../../tmk_core -I../../tmk_core/protocol/lufa -I../../tmk_core/protocol/lufa/LUFA-git -I../../tmk_core/common -std=gnu99 -include config.h -MMD -MP -MF .dep/obj_alps64_protocol_lufa_lufa.o.d  ../../tmk_core/protocol/lufa/lufa.c -o obj_alps64/protocol/lufa/lufa.o
-../../tmk_core/protocol/lufa/lufa.c: In function 'setup_mcu':
-../../tmk_core/protocol/lufa/lufa.c:575: warning: implicit declaration of function 'clock_prescale_set'
-../../tmk_core/protocol/lufa/lufa.c:575: error: 'clock_div_1' undeclared (first use in this function)
-../../tmk_core/protocol/lufa/lufa.c:575: error: (Each undeclared identifier is reported only once
-../../tmk_core/protocol/lufa/lufa.c:575: error: for each function it appears in.)
-make: *** [obj_alps64/protocol/lufa/lufa.o] Error 1
-```
-
-
 ## AVR的BOOTLOADER_SIZE
 注意Teensy2.0++ bootloader的大小是2048字节。有些Makefile注释错了。
 
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