下面用一張圖簡單介紹一下ramfs的產生過程：

如上圖所示，收集到的一些嵌入式相關的原始碼以及package經過PC上的GCC，binutis等工具編譯後得到gcc編譯器，ld，obj，庫等，注意這裡編譯得到的就是嵌入linux的相應編譯工具，它們共同組成嵌入式編譯環境的Toolchain。舉個例子來說，PC上的gcc是基於X86的，而編譯得到的gcc就是基於arm的了。

接下來使用編譯得到的toolchain對package進行編譯得到target，packets等，再加上原來的庫，一齊打包放進資料夾中。該資料夾按照核心中的形式進行組織，包含bin dev etc lib proc sbin sys usr mnt tmp var等相應內容。使用scripts/gen

不過，目前zynq並不是採用這種方式載入linux，由於採用的是ramdisk，必須要把ramdisk，uimage，devicetree下載到記憶體中，記憶體按照不同的地址進行載入。可以參看u-boot目錄下include/configs/zynq_common.h檔案第200行開始的程式碼，該段程式碼說明了需要載入的檔案，摘抄如下：

"norboot=echo Copying Linux from NOR flash to RAM... && " \
		"cp.b 0xE2100000 0x3000000 ${kernel_size} && " \
		"cp.b 0xE2600000 0x2A00000 ${devicetree_size} && " \
		"echo Copying ramdisk... && " \
		"cp.b 0xE2620000 0x2000000 ${ramdisk_size} && " \
		"bootm 0x3000000 0x2000000 0x2A00000\0" \
	"qspiboot=echo Copying Linux from QSPI flash to RAM... && " \
		"sf probe 0 0 0 && " \
		"sf read 0x3000000 0x100000 ${kernel_size} && " \
		"sf read 0x2A00000 0x600000 ${devicetree_size} && " \
		"echo Copying ramdisk... && " \
		"sf read 0x2000000 0x620000 ${ramdisk_size} && " \
		"bootm 0x3000000 0x2000000 0x2A00000\0" \
	"uenvboot=" \
		"if run loadbootenv; then " \
			"echo Loaded environment from ${bootenv}; " \
			"run importbootenv; " \
		"fi; " \
		"if test -n $uenvcmd; then " \
			"echo Running uenvcmd ...; " \
			"run uenvcmd; " \
		"fi\0" \
	"sdboot=if mmcinfo; then " \
			"run uenvboot; " \
			"echo Copying Linux from SD to RAM... && " \
			"fatload mmc 0 0x3000000 ${kernel_image} && " \
			"fatload mmc 0 0x2A00000 ${devicetree_image} && " \
			"fatload mmc 0 0x2000000 ${ramdisk_image} && " \
			"bootm 0x3000000 0x2000000 0x2A00000; " \
		"fi\0" \
	"usbboot=if usb start; then " \
			"run uenvboot; " \
			"echo Copying Linux from USB to RAM... && " \
			"fatload usb 0 0x3000000 ${kernel_image} && " \
			"fatload usb 0 0x2A00000 ${devicetree_image} && " \
			"fatload usb 0 0x2000000 ${ramdisk_image} && " \
			"bootm 0x3000000 0x2000000 0x2A00000; " \
		"fi\0" \
	"nandboot=echo Copying Linux from NAND flash to RAM... && " \
		"nand read 0x3000000 0x100000 ${kernel_size} && " \
		"nand read 0x2A00000 0x600000 ${devicetree_size} && " \
		"echo Copying ramdisk... && " \
		"nand read 0x2000000 0x620000 ${ramdisk_size} && " \
		"bootm 0x3000000 0x2000000 0x2A00000\0" \
	"jtagboot=echo TFTPing Linux to RAM... && " \
		"tftpboot 0x3000000 ${kernel_image} && " \
		"tftpboot 0x2A00000 ${devicetree_image} && " \
		"tftpboot 0x2000000 ${ramdisk_image} && " \
		"bootm 0x3000000 0x2000000 0x2A00000\0" \