On Wed, Sep 10, 2008 at 10:51:50AM +0200, Rodrigo Vilar wrote:
I have enabled cache on a MPC8248 board using Block Address Translation. RAM is cache enabled, everything else cache inhibited. Apparently cache is enabled fine, however system hangs using tftp command (in the middle of the transaction) or on external interrupt handling when I set up a timer from a standalone application. Please note that if I define DBAT0 cache inhibited, both tftp and the standalone program work fine.
Do you have snooping enabled on all of the DMA devices you're using?
lis r3, 0xF000 ori r3, r3, BL_256Mb + Valid_Supervisor + Valid_User lis r4, 0xF000 ori r4, r4, Read_Write + Guarded + Cache_Inhibited mtspr DBAT2U, r3 mtspr DBAT3L, r4 isync
s/DBAT3L/DBAT2L/, presumably.
-Scott