Duncan Haldane <f.duncan.m.haldane@worldnet.att.net>,
In a message on Sat, 22 Feb 2003 20:57:22 -0500 (EST), wrote :
DH> Hi linux-parport kernel developers! (If anyone is still active ...)
DH>
DH> parport_pc in 2.5.x kernels is developing problems through non-maintenance...
DH> (I'd fix them if I were competent, but ....)
DH>
DH> (1) in 2.5.62 parport.o and parport_pc.o can no longer be unloaded "due to
DH> unsafe usage in include/linux/modules.h: 463"
DH> (I don't know what to do to fix this, but
DH> this should be easy for someone knowledgable to fix). This is recent
DH> (since a few 2.5 kernels ago).
DH>
DH> (2) on my parports, ECP capability is no longer being recognized (it is in
DH> 2.4.x, I never got it recognized by 2.5.x kernels) (I'll try to hack
DH> a bit to find out why; do others have this problem?)
Why are you using a 2.5.x kernel instead of a 2.4.x kernel?
DH>
DH> (3) broken/missing ECP read support.
DH> I've been working on IEEE1284 ECP read support for the cpia driver. I got
DH> ECP+DMA read support working in 2.4.x with a blend of code from parport_pc.c
DH> (parport_pc_ecp_read_block_pio() + parport_pc_fifo_write_block_dma()) to make
DH> something like a "parport_pc_ecp_read_block_dma()" that works with cpia.
DH>
DH> But any attempt to use parport_pc_ecp_read_block_pio() for non-DMA PIO ECP reads
DH> just crashes the system (seems like something to do with interrupts(?))
DH>
DH> I note that (two years ago) Fred Barnes left a note that it was broken.....
DH> ------------------------------------------------------------
DH> #ifdef CONFIG_PARPORT_1284
DH> p->ops->ecp_write_data = parport_pc_ecp_write_block_pio;
DH> /* currently broken,but working on it.. (FB) */
DH> /* p->ops->ecp_read_data =parport_pc_ecp_read_block_pio; */
DH>
DH>
DH>
DH> Is there any chance that Linux can get completed ECP support for 2.6.x
DH> or is this stuff just too much of a legacy that no-one is interested in
DH> any more?
DH>
DH> Duncan Haldane
DH>
DH>
DH> ----------------------------------
DH> E-Mail: Duncan Haldane <f.duncan.m.haldane@worldnet.att.net>
DH> Date: 22-Feb-2003
DH> Time: 20:21:30
DH>
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DH>
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