Seems like that r161 commit broke qemu-system-sparc64 ability to access ide cdrom (that is what I test now), because it makes ide i/o port word transfers byteswapped wrt what ide.c expects. If I revert r161 then cdrom becomes visible.
I also need the following patch to unswap drive identification string for printk display.
Now I have: "drive0 [ATAPI cdrom]: QEMU DVD-ROM"
Index: drivers/ide.c =================================================================== --- drivers/ide.c (revision 185) +++ drivers/ide.c (working copy) @@ -861,10 +868,10 @@ /* * if little endian arch, byte swap the string */ -#ifdef CONFIG_LITTLE_ENDIAN +#ifdef CONFIG_BIG_ENDIAN for (p = end ; p != s;) { unsigned short *pp = (unsigned short *) (p -= 2); - *pp = __be16_to_cpu(*pp); + *pp = __le16_to_cpu(*pp); } #endif