RX: Dynamic mapping issues about oh HOT 5 CLOSED

Ok found it, guess I should RTFM first!
https://github.com/parallella/oh/blob/master/elink/hdl/erx_remap.v#L55-L58

   //more complex compresssed map
   assign dynamic_remap[31:0] = addr_in[31:0]    //input
                 - (colid << 20)     //subtracing elink (start at 0)
                 + remap_base[31:0]  //adding back base
                             - (addr_in[31:26]<<$clog2(colid));

... and then this is fed into erx_mmu.

But please explain what's the idea here, don't get it?

from oh.

What does this have to do with the MMU?

On Tue, Feb 2, 2016 at 7:08 PM, Ola Jeppsson [email protected]
wrote:

Ok found it, guess I should read the RTFM first!
https://github.com/parallella/oh/blob/master/elink/hdl/erx_remap.v#L55-L58

//more complex compresssed map
assign dynamic_remap[31:0] = addr_in[31:0] //input
- (colid << 20) //subtracing elink (start at 0)
+ remap_base[31:0] //adding back base
- (addr_in[31:26]<<$clog2(colid));

... and then this is fed into erx_mmu.

But please explain what's the idea here, don't get it?

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from oh.

emesh_remap_packet is input to erx_mmu
https://github.com/parallella/oh/blob/master/elink/hdl/erx_core.v#L163

from oh.

Wrong:
ELINK_RXCFG = { .mmu_enable = 1, .remap_mode = 2} = 0xA

Right
ELINK_RXCFG = { .mmu_enable = 1, .remap_mode = 0} = 0X2

Ok, got it

from oh.

Seems to work :) . Switched to mmu mapping on my driver devel branch.

from oh.