Mstar 方案白板书写加速

环境

        Mstar 8386 android 9 系统

前言

        白板加速原理就是通过直接写android fb 显存。

步骤

一、分配所写fb内存块大小

/* E_MMAP_ID_GOP_FB   */
#define E_MMAP_ID_GOP_FB_LAYER                                 1
#define E_MMAP_ID_GOP_FB_AVAILABLE                             0x0036C31000
#define E_MMAP_ID_GOP_FB_ADR                                   0x0036C31000  //Alignment 0x01000
#define E_MMAP_ID_GOP_FB_GAP_CHK                               0x0000000000
#define E_MMAP_ID_GOP_FB_LEN                                   0x0006100000
#define E_MMAP_ID_GOP_FB_MEMORY_TYPE                           (MIU0 | TYPE_NONE | UNCACHE | TYPE_NONE)
#define E_MMAP_ID_GOP_FB_C