[Qemu-devel] LSI53C895A: Implement Scratch Byte Register

[Sebastian Herbszt]

Qemu exits with

lsi_scsi: error: Unhandled writeb 0x3a = 0x0
lsi_scsi: error: readb 0x3a

when trying to use LSI option rom 8xx_64.rom.

- Sebastian

--- qemu-r6125/hw/lsi53c895a.c.orig Tue Dec 23 17:53:51 2008
+++ qemu-r6125/hw/lsi53c895a.c Tue Dec 23 17:57:31 2008
@@ -261,6 +261,7 @@ typedef struct {
    uint32_t sbc;
    uint32_t csbc;
    uint32_t scratch[18]; /* SCRATCHA-SCRATCHR */
+    uint8_t sbr;

    /* Script ram is stored as 32-bit words in host byteorder.  */
    uint32_t script_ram[2048];
@@ -329,6 +330,7 @@ static void lsi_soft_reset(LSIState *s)
    s->ia = 0;
    s->sbc = 0;
    s->csbc = 0;
+    s->sbr = 0;
}

static int lsi_dma_40bit(LSIState *s)
@@ -1404,6 +1406,8 @@ static uint8_t lsi_reg_readb(LSIState *s
        return s->dmode;
    case 0x39: /* DIEN */
        return s->dien;
+    case 0x3a: /* SBR */
+        return s->sbr;
    case 0x3b: /* DCNTL */
        return s->dcntl;
    case 0x40: /* SIEN0 */
@@ -1616,6 +1620,9 @@ static void lsi_reg_writeb(LSIState *s, 
    case 0x39: /* DIEN */
        s->dien = val;
        lsi_update_irq(s);
+        break;
+    case 0x3a: /* SBR */
+        s->sbr = val;
        break;
    case 0x3b: /* DCNTL */
        s->dcntl = val & ~(LSI_DCNTL_PFF | LSI_DCNTL_STD);