Hello. Antonio Martins wrote:
Booting with CONFIG_BLK_DEV_CS5530=n and CONFIG_PATA_CS5530=y and libdata_dma_mask=0 kernel 2.6.24.7: ... ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx Driver 'sd' needs updating - please use bus_type methods scsi0: pata_cs5530 scsi1: pata_cs5530 ata1: PATA max UDMA/33 cmd 0x1f0 ctl 0x3f6 bmdma 0xfc00 irq 14 ata2: PATA max UDMA/33 cmd 0x170 ctl 0x376 bmdma 0xfc08 irq 15 ata1.00: ATA-5: SILICON POWER, 2.0, mas UDMA/66 ata1.00: 2000880 sectors, multi 1: LBA ata1.00: configured for PIO4 scsi 0:0:0:0: Direct-Access ATA SILICON POWER 2.0 PQ: 0 ANSI: 5 sd 0:0:0:0: [sda] 2000880 512-byte hardware sectors (1024 MB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA sd 0:0:0:0: [sda] 2000880 512-byte hardware sectors (1024 MB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA sda: sda1
And now it all works nicely
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) So PIO4 is now working. Great. But i am stuck with the root device.
I would suggest posting to linux-kernel on that and talking to H Peter Anvin about possible ways to get a real boot loader on the box.
So regarding DMA, Netvista 8363 has this limitation, and there is no DMA or UDMA mode that we can successfully enable. The only way to force PIO4, is changing directly in the source code. If kernel parameters were supported, we would be able to use some "idebus" parameter. Are these statements correct?
There's "libata.dma=" option (if you can pass it), set it to 0 and DMA won't ever be used. Note that the "old" IDE code also has the parameter controlling DMA usage (even per drive) -- look for "nodma" in Documentation/ide/ide.txt. MBR, Sergei -- 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
