implicit declaration of function 'lzma_decode'

[zhanweixin]

在V821_SDK_V1.1里，采用NOR Flash为介质，当适配SPI LCD，编译时发生如下错误

/data/V821/V821_SDK_V1.1/kernel/linux-5.4-ansc/bsp/modules/gpu/Makefile:72: neither CONFIG_ARM nor CONFIG_ARM64 is found in .config, unsupport
2 sun300iw1p1,/data/V821/V821_SDK_V1.1/kernel/linux-5.4-ansc, /data/V821/V821_SDK_V1.1/out/v821/kernel/build 
  CC      drivers/video/backlight/backlight.o
  AR      drivers/video/backlight/built-in.a
  CC      bsp/drivers/video/sunxi/lcd_fb/dev_lcd_fb.o
  CC      bsp/drivers/video/sunxi/lcd_fb/disp_lcd.o
  CC      bsp/drivers/video/sunxi/lcd_fb/dev_fb.o
  CC      bsp/drivers/video/sunxi/lcd_fb/logo.o
/data/V821/V821_SDK_V1.1/kernel/linux-5.4-ansc/bsp/drivers/video/sunxi/lcd_fb/logo.c: In function 'Fb_map_kernel_logo':
/data/V821/V821_SDK_V1.1/kernel/linux-5.4-ansc/bsp/drivers/video/sunxi/lcd_fb/logo.c:228:10: error: implicit declaration of function 'lzma_decode' [-Werror=implicit-function-declaration]
  228 |   return lzma_decode(paddr, info);
      |          ^~~~~~~~~~~

通过阅读BSP相关代码，发现在/bsp/drivers/video/sunxi/disp2/disp/dev_fb.c实现lzma_decode函数

#if IS_ENABLED(CONFIG_DECOMPRESS_LZMA)
int lzma_decode(uintptr_t paddr, struct fb_info *info)
{
	void *vaddr = NULL;
	long pos = 0;
	unsigned char *out = NULL;
	int ret = -1, i = 0;
	struct lzma_header lzma_head;
	......     

通过在make kernel_menuconfig里搜索CONFIG_DECOMPRESS_LZMA也已配置为Y，但为何还会发生这个现象呢？

│ Symbol: DECOMPRESS_LZMA [=y]                                                                                                                       │  
  │ Type  : tristate                                                                                                                                   │  
  │   Defined at lib/Kconfig:316                                                                                                                       │  
  │   Selected by [y]:                                                                                                                                 │  
  │   - RD_LZMA [=y] && BLK_DEV_INITRD [=y]                                                                                                            │  
  │   - AW_DISP2_FB_DECOMPRESS_LZMA [=y] && FB [=y] && AW_DISP2 [=y]                                                                                   │  
  │   - AW_REMOTEPROC_USE_UNLZMA [=y] && AW_BSP [=y] && AW_REMOTEPROC [=y] && AW_REMOTEPROC_DECOMPRESS_FW [=y]                                         │  
  │                                                                                                                                                    │  
  │                                                                                                                                                    │  
  │ Symbol: AW_DISP2_FB_DECOMPRESS_LZMA [=y]                                                                                                           │  
  │ Type  : bool                                                                                                                                       │  
  │ Prompt: Framebuffer show bootlogo from lzma file                                                                                                   │  
  │   Location:                                                                                                                                        │  
  │     -> Allwinner BSP                                                                                                                               │  
  │       -> Device Drivers                                                                                                                            │  
  │ (1)     -> Video Drivers                                                                                                                           │  
  │   Defined at bsp/drivers/video/sunxi/Kconfig:59                                                                                                    │  
  │   Depends on: FB [=y] && AW_DISP2 [=y]                                                                                                             │  
  │   Selects: DECOMPRESS_LZMA [=y]                                                                                                                    │  
  │                                         

[awwwwa]

ca09e45.diff

[zhanweixin]

完美解决，万分感谢！！！