uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(74)：initramfs

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ADI bf561 DSP

优视BF561EVB开发板

uclinux-2008r1.5-rc3(smp patch)

Visual DSP++ 5.0(update 5)

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默认情况下，内核使用了initramfs做为rootfs，而为了将rootfs与内核放在一起，在链接文件ldf中做了一下处理：

.init.ramfs

{

INPUT_SECTION_ALIGN(4)

___initramfs_start = .;

INPUT_SECTIONS($LIBRARIES_SML3_CM(.init.ramfs))

___initramfs_end = .;

} > MEM_UCLINUX_INIT_RAMFS

.init.ramfs这个段其实只有一个数据，那就是rootfs。为此选择rootfs.initramfs这个文件，将之插入到内核中。建一个.s的汇编文件，插入两行代码：

.section .init.ramfs,"a"

.inc/binary "rootfs.initramfs"

这样，就可以将rootfs.initramfs文件的内容放到.init.ramfs段中了。

参考VDSP文档：

INC/BINARY, Include Contents of a File

---

The .INC/BINARY directive includes the content of file at the current location. You can control the search paths used via the -i command-line switch (click here).

Syntax:

.INC/BINARY [ symbol = ] "filename" [,skip [,count]] ;

.INC/BINARY [ symbol[] = ] "filename" [,skip [,count]] ;

where

symbol – the name of a symbol to associate with the data being included from the filefilename – the name of the file to include. The argument is enclosed in double quotes.

The skip argument skips a number of bytes from the start of the file.

The count argument indicates the maximum number of bytes to read.

Example:

.SECTION data1;

.VAR jim;

.INC/BINARY sym[] = "bert",10,6;

.VAR fred;

.INC/BINARY Image1[] = "photos/Picture1.jpg";

1 参考资料

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(69)：SHARED_MEMORY(2009-02-20)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(70)：保留VDSP的heap(2009-02-20)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(71)：l1_data_sram_init的疑惑(2009-02-20)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(72)：中断时SP的保存(2009-2-22)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(73)：.init.setup(2009-02-27)