From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46155) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YAbTR-0000ud-Ml for qemu-devel@nongnu.org; Mon, 12 Jan 2015 04:39:51 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YAbTO-00064I-F4 for qemu-devel@nongnu.org; Mon, 12 Jan 2015 04:39:49 -0500 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:59882 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YAbTO-000643-57 for qemu-devel@nongnu.org; Mon, 12 Jan 2015 04:39:46 -0500 Message-ID: <54B3965D.3060006@kamp.de> Date: Mon, 12 Jan 2015 10:39:41 +0100 From: Peter Lieven MIME-Version: 1.0 References: <54B393A2.3090702@kamp.de> In-Reply-To: <54B393A2.3090702@kamp.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Missing Diag/Debug Registers in lsi53c895a emulation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini , "qemu-devel@nongnu.org" On 12.01.2015 10:28, Peter Lieven wrote: > Hi, > > while trying to run an ASA1000V appliance I found that registers 0x09 and 0x3c-3f are read during boot up. Which > currently results in an exit(1). The appliance uses an quite ancient 2.6.29.6 Linux kernel. > These registers are mainly for diag and debug purposes so I came up with the following patch. The system works > with the following patch, but I wonder if this is a correct workaround: Maybe this is better: 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 */