Samsung V1.3.0 - Manuals

IV Linux RFS v1.3.0 Porting Guide Table of Contents 1 Introduction ......................................................................................... 1 1.1 Overview ........................................................................................ 1 1.2 Features ...........................

Tables Table 1 Host System Requirements ......................................................................... 4 Table 2 RFS Static Memory Usage (in bytes) .............................................................. 6 Table 3 Hardware information of OMAP2420 ......................................

VI Linux RFS v1.3.0 Porting Guide Figures Figure 1-1 Linux RFS Architecture .......................................................................... 2 Figure 2-1 Directory Structure of Linux RFS Package .................................................... 4 Figure 2-2 Linux RFS Source Files (Annot...

1 Introduction This chapter describes the overview and system architecture of RFS. It also covers the information about low-level flash memory partitions. 1.1 Overview Linux RFS (Linux Robust FAT File System) is a FAT compatible file system to use OneNAND/NAND flash memory as storage on any consumer...

2 Linux RFS v1.3.0 Porting Guide Figure 1-1 Linux RFS Architecture † File Systems Linux file system for flash devices is managed by two file systems: CRAMFS and RFS. Both of these file systems run under Linux VFS (Virtual File System). • CRAMFS: This is a read-only file system included in a standard...

4 Linux RFS v1.3.0 Porting Guide 2 Prerequisites This chapter explains the host/target system environment for porting RFS to your target system. Host is Linux PC environment and target can be any kind of consumer device using OneNAND flash memory. 2.1 Host Environment The following table shows the h...

† fs – RFS file system module † drivers - XSR block device driver module † tools - Utilities to manipulate RFS ‡ scripts- RFS Package Installation scripts ‡ Include – includes header files 2.2.2 Source Files List This section gives short description of source files listed in the ‘rfs’ and ‘xsr’ dire...

6 Linux RFS v1.3.0 Porting Guide Most of the sources are platform-independent codes except PAM. Please refer the “XSR Porting Guide” for more detailed information. Before going into detail about RFS customization according to target requirement, next section will explain about objects that Linux RFS...

3 Porting Linux RFS This chapter describes porting overview, hardware configuration for OneNAND, Linux RFS initialization and porting procedure with OMAP2420 target board. 3.1 Porting Overview This section describes Linux RFS porting procedure briefly. The procedure is divided into 5 steps as shown ...

8 Linux RFS v1.3.0 Porting Guide If you are using Linux kernel 2.4.xx specify ‘kernel type’ as 24. If you are using Linux kernel 2.6.xx specify ‘kernel type’ as 26. Shell> cd $(TOP_DIR) Shell> $(RFS_TOP_DIR)/scripts/rfs_install.sh 24 3.2.2 Kernel Configuration for RFS 3.2.2.1 Menu Configuratio...

Figure 3-3 File system screen of Kernel menu Figure 3-3 shows the detailed RFS configuration. 1. The first is FAT32 and long file name support 2. The second is direct I/O support. But, this feature is experimental and should not be used in production environment. 3. The third is debugging message op...

10 Linux RFS v1.3.0 Porting Guide Figure 3-4 Code maturity level † You should set the make option for “COMPRESSED ROM FILE SYSTEM (CRAMFS)” in file system option during make menuconfig because the root file system is managed by CRAMFS.

Figure 3-5 CRMAFS OPTION Settings Now, you can proceed to build the kernel and the kernel modules. Before starting build process your kernel cross compile path ‘CROSS_COMPILE = ’ must be set in $(KERNEL_TOP_DIR)/Makefile. To build the kernel, type the following commands in sequence. shell> cd $(K...

12 Linux RFS v1.3.0 Porting Guide After all of these steps, you will have the kernel image ‘uImage’. For usage of OneNAND device on your target, please refer to ftools utility guide. 3.3 Using the NLS (Native Language Support) The FAT Filesystem can deal with filenames in native language character s...

Figure 3-7 NLS(Native Language Support) configuration And you should select the codepages like the default codepage and other codepages to be used at the target. Then, the codepages will be compiled as built-in or module. For example, if you set the default codepage to “cp949” for Korean, you have t...

14 Linux RFS v1.3.0 Porting Guide Figure 3-8 RFS Filesystem configuration for FAT16 If you decide to build RFS Filesystem as FAT16 type, you always make the filenames with the native language in the 8.3 format regardless of NLS support. Why is this possible? The NLS is used for the conversion the fi...

16 Linux RFS v1.3.0 Porting Guide Appendix I. Description of FAT Configuration Option z CONFIG_RFS_FS Description Configuration option for RFS Behavioral description This option should be set for RFS support. Additional notice None z CONFIG_RFS_VFAT Description To avoid the patent problems related t...