[Linux-parport] hardware ECP reads
mc at msss.com
Mon Dec 5 19:33:09 EST 2005
After going through the process of recompiling the parport driver to
use ECP, I've discovered that seemingly even with all of the options
enabled (CONFIG_PARPORT_PC_FIFO, CONFIG_PARPORT_1284), ECP reads still
always go through the software emulation function in
parport_ieee1284_ecp_read_data, and are very very slow.
The key seems to be the fact that parport_pc_ecp_read_block_pio is
never called by the driver, as indicated by the comment "currently
broken, but working on it.. (FB)".
I'm doing the tests on RH 9 (kernel 2.4.20-8) but the code in the
latest 2.6 stable release (22.214.171.124) appears to be the same.
Is this true, or am I confused? Is the driver unable to do ECP
hardware reads? If true it's unfortunate, since I was so looking to
be able to migrate all of my DOS ECP-reading applications over to
Mike Caplinger, Malin Space Science Systems
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