Getting 404 for checkout controllers from 1.6, but it was working fine with 1.5

Try by removing the entire rewrite part from config.xml, then use frontend routers like below.

Remove below code

    <global>
        <rewrite>
            <MyNameSpace_MyModule_cart>
                <from><![CDATA[#^/checkout/cart#]]></from>
                <to>MyNameSpace_MyModule/cart</to>
                <override_actions>false</override_actions>
            </MyNameSpace_MyModule_cart>
        </rewrite>
    </global>

Use below code only…

    <frontend>
        <routers>
            <checkout>
                <args>
                    <modules>
                        <MyNameSpace_MyModule before="Mage_Checkout">MyNameSpace_MyModule</MyNameSpace_MyModule>
                    </modules>
                </args>
            </checkout>
        </routers>
    </frontend>

It working for me.. let me know if have any suggetions…

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