On Wed, Oct 11, 2000 at 12:59:59AM +0900, Atsushi Onoe wrote:

 > I'm porting tulip driver to newsmips.

Cool!

 > There is a 21140A (without MII) board for APbus, which is a big-endian bus
 > for NWS-4000/5000 series of newsmips.  Since all PCI I/O and DMA access for
 > tulip is translated to APbus (big-endian bus) within the board, I have to
 > set BUSMODE_BLE, and BUSMODE_DBO to live with htole32()/le32toh() in tulip.c
 > for descriptor access.  Also PBL is required to restrict burst length on
 > some hardware.

Oh foo.  I really need to get off my duff and do the bus_dma mods that
I want to do... but anyway, we can get around this...

 > How should I set these BUSMODE flags for tulip?  Is it reasonable to move
 > sc_preinit() hook after initialization of sc->sc_busmode?

No, that won't work.  You have to do preinit before reset.

How about adding:

	sc_busmode_pbl

members to the tulip_softc structure to indicate the default PBL to use
for that chip (initialize it to something appropriate in the existing
front-ends), and add new TULIPF_BLE and TULIPF_DBO flags that the front-end
can set to indicate that tlp_init() should set those BUSMODE bits.

Does that sound reasonable?

-- 
        -- Jason R. Thorpe <thorpej@zembu.com>