我们有时希望传输文件到qemu里，那如何做了？官方给的答复： Simple: Treat the virtual machine as if it was a real machine andtransfer files to and from it. More to the point, the following are the most common...

本文首先从Ext4认识Android文件块映射，然后从生成EROFS文件系统的三个部分(非压缩文件、压缩文件和尾端数据)分析如何生成block list文件。

内核参考5.x: const struct address_space_operations squashfs_aops = { .readpage = squashfs_readpage}; static int squashfs_readpage(struct file *file, struct page *page...

I always want to use the 7.5 e-Paper(i already have) to display weather forecast instead of my previous solution displayed on LCD. You know, the old one is not beautiful for me any...

参考erofs-utils 1.2.1, 入口是erofs_mkfs_build_tree(), 不关注xattr/extent, 看之前我们再了解下inode: Inodes store information about files and directories (folders), such as file ownership, acce...

先看HW架构 CQE: Command Queueing Engine，负责管理software和eMMC device的data传输。 首先CQE接收来自SW的task(via TDL和doorbell)，接下来的command flows主要有三步： Step1. Queuing a Transaction(CMD44+CMD45) CQE发出CMD...

先来看看JEDEC有关WriteBooster(WB)的描述： TLC NAND比SLC NAND慢的原因就是TLC里面有更多的programming steps。ok，为了提高性能，那就把TLC NAND的一部分配置成SLC NAND不就行了。rt，WriteBooster特性由此而来，就是把这部分SLC NAND用作WriteBooster Buffer...

参考内核5.x, code是kernel/sched/cpufreq_schedutil.c，配置说明： config CPU_FREQ_GOV_SCHEDUTIL bool “‘schedutil’ cpufreq policy governor” depends on CPU_FREQ && ...

EAS全称是Energy Aware Scheduling，主要目标就是降低功耗同时兼顾性能，专门针对异构CPU，比如Arm大小核架构。 EAS利用task load(PELT or WALT) 和 Engery Model (EM) 找到engergy-efficient CPU。 这里的PELT是per-entity load tracking，上游Li...

H的erofs已经支持Android，QC/droid 10下生成镜像有如下错误： failed to find [app] in canned fs_config code在system/core/libcutils/canned_fs_config.cpp: void canned_fs_config(const...