=== modified file 'firmware/target/arm/ata-pp5020.c'
--- firmware/target/arm/ata-pp5020.c    2009-07-09 16:45:40 +0000
+++ firmware/target/arm/ata-pp5020.c    2009-07-20 14:46:03 +0000
@@ -160,6 +160,9 @@
 bool ata_dma_setup(void *addr, unsigned long bytes, bool write) {
     if (bytes <= 512 || ((unsigned long)addr & 3))
         return false;
+    /* Require cacheline alignment for reads to prevent interference */
+    if (!write && ((unsigned long)addr & 15))
+        return false;

 #if ATA_MAX_UDMA > 2
     if (dma_needs_boost && !dma_boosted) {
@@ -175,8 +178,6 @@
     else {
         /* Invalidate cache because new data may be present in RAM */
         cpucache_invalidate();
-        /* TODO: Alignment to cache line boundaries should be performed
-           pre/post DMA */
     }

     /* Clear pending interrupts so ata_dma_finish() can wait for an