hi Suresh In linux kmelloc returns the pointer to virtual address not the physical address, to return to the physical address there is different function called ioremap
for eg :- char *buf_tx =kmalloc(100,GFP_KERNEL); // Tx buffer char *buf_rx=kmalloc(100,GFP_KERNEL); // Rx buffer ptr_tx=ioremap( buf_tx,100); ptr_rx=ioremap(buf_rx,100); To learn more about this go through Linux device driver by rubini I hope this will work for you regard Misbah suresh suresh wrote: > > Hi, > > I am porting MPC8280 driver from vxWorks to Linux. > > I want know the address return by kmalloc function? is it physical address > or kernel virtual address. > > For Tx and Rx, hardware uses buffers, so I have to allocate buffers and > pass > the pointer to hardware. Can I pass the pointer returned kmalloc? or I > should convert it into physical address? > > If it returns kernel virtual address, then how to convert into physical? > > Thanks & Regards- > Suresh > > _______________________________________________ > Linuxppc-embedded mailing list > [email protected] > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > -- View this message in context: http://www.nabble.com/Kmalloc-returns-which-address-tf4086826.html#a11705981 Sent from the linuxppc-embedded mailing list archive at Nabble.com. _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
