repo 如何切换其他branch

studyboy_3w

repo init -u git://android.git.kernel.org/platform/manifest.git -b eclair
我可以获得eclair branch  但是如何获得froyo 的branch和
android-2.2.1_r1的tag

git://android.git.kernel.org/platform/manifest
* [new branch]      android-1.5 -> origin/android-1.5
* [new branch]      android-1.5r2 -> origin/android-1.5r2
* [new branch]      android-1.5r3 -> origin/android-1.5r3
* [new branch]      android-1.5r4 -> origin/android-1.5r4
* [new branch]      android-1.6_r1 -> origin/android-1.6_r1
* [new branch]      android-1.6_r1.1 -> origin/android-1.6_r1.1
* [new branch]      android-1.6_r1.2 -> origin/android-1.6_r1.2
* [new branch]      android-1.6_r1.3 -> origin/android-1.6_r1.3
* [new branch]      android-1.6_r1.4 -> origin/android-1.6_r1.4
* [new branch]      android-1.6_r1.5 -> origin/android-1.6_r1.5
* [new branch]      android-1.6_r2 -> origin/android-1.6_r2
* [new branch]      android-2.0.1_r1 -> origin/android-2.0.1_r1
* [new branch]      android-2.0_r1 -> origin/android-2.0_r1
* [new branch]      android-2.1_r1 -> origin/android-2.1_r1
* [new branch]      android-2.1_r2 -> origin/android-2.1_r2
* [new branch]      android-2.1_r2.1p -> origin/android-2.1_r2.1p
* [new branch]      android-2.1_r2.1p2 -> origin/android-2.1_r2.1p2
* [new branch]      android-2.1_r2.1s -> origin/android-2.1_r2.1s
* [new branch]      android-2.2.1_r1 -> origin/android-2.2.1_r1
* [new branch]      android-2.2_r1 -> origin/android-2.2_r1
* [new branch]      android-2.2_r1.1 -> origin/android-2.2_r1.1
* [new branch]      android-2.2_r1.2 -> origin/android-2.2_r1.2
* [new branch]      android-2.2_r1.3 -> origin/android-2.2_r1.3
* [new branch]      android-2.3.1_r1 -> origin/android-2.3.1_r1
* [new branch]      android-2.3_r1 -> origin/android-2.3_r1
* [new branch]      android-adt-0.9.8 -> origin/android-adt-0.9.8
* [new branch]      android-adt-0.9.9 -> origin/android-adt-0.9.9
* [new branch]      android-cts-2.1_r2 -> origin/android-cts-2.1_r2
* [new branch]      android-cts-2.1_r3 -> origin/android-cts-2.1_r3
* [new branch]      android-cts-2.1_r4 -> origin/android-cts-2.1_r4
* [new branch]      android-cts-2.1_r5 -> origin/android-cts-2.1_r5
* [new branch]      android-cts-2.2_r1 -> origin/android-cts-2.2_r1
* [new branch]      android-cts-2.2_r2 -> origin/android-cts-2.2_r2
* [new branch]      android-cts-2.2_r3 -> origin/android-cts-2.2_r3
* [new branch]      android-cts-2.2_r4 -> origin/android-cts-2.2_r4
* [new branch]      android-sdk-1.5-pre -> origin/android-sdk-1.5-pre
* [new branch]      android-sdk-1.5_r1 -> origin/android-sdk-1.5_r1
* [new branch]      android-sdk-1.5_r3 -> origin/android-sdk-1.5_r3
* [new branch]      android-sdk-1.6-docs_r1 -> origin/android-sdk-1.6-docs_r1
* [new branch]      android-sdk-1.6_r1 -> origin/android-sdk-1.6_r1
* [new branch]      android-sdk-1.6_r2 -> origin/android-sdk-1.6_r2
* [new branch]      android-sdk-2.0.1-docs_r1 -> origin/android-sdk-2.0.1-docs_r1
* [new branch]      android-sdk-2.0.1_r1 -> origin/android-sdk-2.0.1_r1
* [new branch]      android-sdk-2.0_r1 -> origin/android-sdk-2.0_r1
* [new branch]      android-sdk-2.1_r1 -> origin/android-sdk-2.1_r1
* [new branch]      android-sdk-2.2_r1 -> origin/android-sdk-2.2_r1
* [new branch]      android-sdk-2.2_r2 -> origin/android-sdk-2.2_r2
* [new branch]      android-sdk-tools_r2 -> origin/android-sdk-tools_r2
* [new branch]      android-sdk-tools_r3 -> origin/android-sdk-tools_r3
* [new branch]      android-sdk-tools_r4 -> origin/android-sdk-tools_r4
* [new branch]      android-sdk-tools_r5 -> origin/android-sdk-tools_r5
* [new branch]      android-sdk-tools_r6 -> origin/android-sdk-tools_r6
* [new branch]      android-sdk-tools_r7 -> origin/android-sdk-tools_r7
* [new branch]      cdma-import -> origin/cdma-import
* [new branch]      cupcake    -> origin/cupcake
* [new branch]      cupcake-release -> origin/cupcake-release
* [new branch]      donut      -> origin/donut
* [new branch]      donut-plus-aosp -> origin/donut-plus-aosp
* [new branch]      eclair     -> origin/eclair
* [new branch]      froyo      -> origin/froyo
* [new branch]      froyo-plus-aosp -> origin/froyo-plus-aosp
* [new branch]      gingerbread -> origin/gingerbread
* [new branch]      master     -> origin/master
* [new branch]      release-1.0 -> origin/release-1.0
* [new branch]      tools_r7   -> origin/tools_r7
* [new branch]      tools_r8   -> origin/tools_r8
* [new branch]      tools_r9   -> origin/tools_r9
* [new tag]         android-1.5 -> android-1.5
* [new tag]         android-1.5r2 -> android-1.5r2
* [new tag]         android-1.5r3 -> android-1.5r3
* [new tag]         android-1.5r4 -> android-1.5r4
* [new tag]         android-1.6_r1 -> android-1.6_r1
* [new tag]         android-1.6_r1.1 -> android-1.6_r1.1
* [new tag]         android-1.6_r1.2 -> android-1.6_r1.2
* [new tag]         android-1.6_r1.3 -> android-1.6_r1.3
* [new tag]         android-1.6_r1.4 -> android-1.6_r1.4
* [new tag]         android-1.6_r1.5 -> android-1.6_r1.5
* [new tag]         android-1.6_r2 -> android-1.6_r2
* [new tag]         android-2.0.1_r1 -> android-2.0.1_r1
* [new tag]         android-2.0_r1 -> android-2.0_r1
* [new tag]         android-2.1_r1 -> android-2.1_r1
* [new tag]         android-2.1_r2 -> android-2.1_r2
* [new tag]         android-2.1_r2.1p -> android-2.1_r2.1p
* [new tag]         android-2.1_r2.1p2 -> android-2.1_r2.1p2
* [new tag]         android-2.1_r2.1s -> android-2.1_r2.1s
* [new tag]         android-2.2.1_r1 -> android-2.2.1_r1
* [new tag]         android-2.2_r1 -> android-2.2_r1
* [new tag]         android-2.2_r1.1 -> android-2.2_r1.1
* [new tag]         android-2.2_r1.2 -> android-2.2_r1.2
* [new tag]         android-2.2_r1.3 -> android-2.2_r1.3
* [new tag]         android-2.3.1_r1 -> android-2.3.1_r1
* [new tag]         android-2.3_r1 -> android-2.3_r1
* [new tag]         android-adt-0.9.8 -> android-adt-0.9.8
* [new tag]         android-adt-0.9.9 -> android-adt-0.9.9
* [new tag]         android-cts-2.1_r2 -> android-cts-2.1_r2
* [new tag]         android-cts-2.1_r3 -> android-cts-2.1_r3
* [new tag]         android-cts-2.1_r4 -> android-cts-2.1_r4
* [new tag]         android-cts-2.1_r5 -> android-cts-2.1_r5
* [new tag]         android-cts-2.2_r1 -> android-cts-2.2_r1
* [new tag]         android-cts-2.2_r2 -> android-cts-2.2_r2
* [new tag]         android-cts-2.2_r3 -> android-cts-2.2_r3
* [new tag]         android-cts-2.2_r4 -> android-cts-2.2_r4
* [new tag]         android-sdk-1.5-pre -> android-sdk-1.5-pre
* [new tag]         android-sdk-1.5_r1 -> android-sdk-1.5_r1
* [new tag]         android-sdk-1.5_r3 -> android-sdk-1.5_r3
* [new tag]         android-sdk-1.6-docs_r1 -> android-sdk-1.6-docs_r1
* [new tag]         android-sdk-1.6_r1 -> android-sdk-1.6_r1
* [new tag]         android-sdk-1.6_r2 -> android-sdk-1.6_r2
* [new tag]         android-sdk-2.0.1-docs_r1 -> android-sdk-2.0.1-docs_r1
* [new tag]         android-sdk-2.0.1_r1 -> android-sdk-2.0.1_r1
* [new tag]         android-sdk-2.0_r1 -> android-sdk-2.0_r1
* [new tag]         android-sdk-2.1_r1 -> android-sdk-2.1_r1
* [new tag]         android-sdk-2.2_r1 -> android-sdk-2.2_r1
* [new tag]         android-sdk-2.2_r2 -> android-sdk-2.2_r2