On 12/01/2015 10:45, Peter Lieven wrote:
> Some ancient Linux kernels read from registers 0x09 and 0x3c-3f during
> boot. According to the spec these registers are for diag and debug
> purposes only. If they are absend qemu aborts on read.
>
> Signed-off-by: Peter Lieven <p...@kamp.de>
> ---
> hw/scsi/lsi53c895a.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
> index ec92048..db7d4b8 100644
> --- a/hw/scsi/lsi53c895a.c
> +++ b/hw/scsi/lsi53c895a.c
> @@ -277,6 +277,7 @@ typedef struct {
> uint32_t csbc;
> uint32_t scratch[18]; /* SCRATCHA-SCRATCHR */
> uint8_t sbr;
> + uint32_t adder;
>
> /* Script ram is stored as 32-bit words in host byteorder. */
> uint32_t script_ram[2048];
> @@ -1389,6 +1390,7 @@ again:
> switch ((insn >> 27) & 7) {
> case 0: /* Jump */
> DPRINTF("Jump to 0x%08x\n", addr);
> + s->adder = addr;
> s->dsp = addr;
> break;
> case 1: /* Call */
> @@ -1513,6 +1515,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset)
> return 0x7f;
> case 0x08: /* Revision ID */
> return 0x00;
> + case 0x09: /* SOCL */
> + return s->socl;
> case 0xa: /* SSID */
> return s->ssid;
> case 0xb: /* SBCL */
> @@ -1577,6 +1581,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset)
> return s->sbr;
> case 0x3b: /* DCNTL */
> return s->dcntl;
> + /* ADDER Output (Debug of relative jump address) */
> + CASE_GET_REG32(adder, 0x3c)
> case 0x40: /* SIEN0 */
> return s->sien0;
> case 0x41: /* SIEN1 */
>
Thanks!
Paolo
