Hi all,
on our embedded system we connected a HDD via FPGA driectly to the CPU.
And wrote a evry simple IDE driver for it. BAsicly the HDD internbal
registers are just memory mapped. No DMA is supported by the hardware.
But I think it would be capable of 48bit LBA mode (which just means setting
the HOB bit in the device control register of the HDD correctly?)
Now I wonder what the impact of setting
hwif->no_lba48 = 1; /* 1 = cannot do LBA48 */
hwif->no_lba48_dma = 1; /* 1 = cannot do LBA48 DMA */
would be.
IIUC then no_lba48 would limit the useable size to 130GB?
Will every HDD work with no_lba48 set to 1? Even those which actually
support 48bit LBA?
How about performance impact of
if (hwif->no_lba48 || hwif->no_lba48_dma)
hwif->rqsize = 256;
else
hwif->rqsize = 65536;
in ide-probe.c ?
Thanks a million for any pointers!
Steven
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