EntityFramework(Code First) and MySql (no replies)

I'm experimenting with EntityFramework (version 4.3.1) and CodeFirst Dev in my project. After I've defined my models and extended the DBContext as the sample on msdn, I found that the code run correctly on SQLServer, but not on MySql (version 5.1.61,connector/net version 6.4.4). The exception was like this:


Exception: MySql.Data.MySqlClient.MySqlException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near
'NOT NULL,
`ProductVersion` mediumtext NOT NULL);
ALTER TABLE `HistoryRow` ' at line 6

Then I tried capturing the SQL scripts which the EntityFramework auto-generated, some statements in the scripts brought to my attention:

CREATE TABLE `__MigrationHistory`(
`MigrationId` mediumtext NOT NULL,
`CreatedOn` datetime NOT NULL,
`Model` varbinary NOT NULL,
`ProductVersion` mediumtext NOT NULL);

I copied it in the environment of MySql command line client, and got the same error message. By checking this statement block, I found the keyword "varbinary" was not supported in MySql. It could run correctly if I changed "varbinary" to "varbinary(1)". Even so, I can't change the auto-generation of EntityFramework, of course.
So, is there anybody to help me out? Is there something I'm doing wrong here?