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-rw-r--r--drivers/ata/sata_mv.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index fe0105d35ba..37b850ae084 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -2506,11 +2506,31 @@ static int mv_chip_id(struct ata_host *host, unsigned int board_idx)
if (pdev->vendor == PCI_VENDOR_ID_TTI &&
(pdev->device == 0x2300 || pdev->device == 0x2310))
{
- printk(KERN_WARNING "sata_mv: Highpoint RocketRAID BIOS"
- " will CORRUPT DATA on attached drives when"
- " configured as \"Legacy\". BEWARE!\n");
- printk(KERN_WARNING "sata_mv: Use BIOS \"JBOD\" volumes"
- " instead for safety.\n");
+ /*
+ * Highpoint RocketRAID PCIe 23xx series cards:
+ *
+ * Unconfigured drives are treated as "Legacy"
+ * by the BIOS, and it overwrites sector 8 with
+ * a "Lgcy" metadata block prior to Linux boot.
+ *
+ * Configured drives (RAID or JBOD) leave sector 8
+ * alone, but instead overwrite a high numbered
+ * sector for the RAID metadata. This sector can
+ * be determined exactly, by truncating the physical
+ * drive capacity to a nice even GB value.
+ *
+ * RAID metadata is at: (dev->n_sectors & ~0xfffff)
+ *
+ * Warn the user, lest they think we're just buggy.
+ */
+ printk(KERN_WARNING DRV_NAME ": Highpoint RocketRAID"
+ " BIOS CORRUPTS DATA on all attached drives,"
+ " regardless of if/how they are configured."
+ " BEWARE!\n");
+ printk(KERN_WARNING DRV_NAME ": For data safety, do not"
+ " use sectors 8-9 on \"Legacy\" drives,"
+ " and avoid the final two gigabytes on"
+ " all RocketRAID BIOS initialized drives.\n");
}
case chip_6042:
hpriv->ops = &mv6xxx_ops;