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 - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
