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VAX630: Fix watch chip behavior the first time a file is attached to the NVR device.

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This commit is contained in:
Mark Pizzolato 2013-08-21 14:31:31 -07:00
parent d3135b777d
commit 1a48d85d73
1 changed files with 13 additions and 0 deletions
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13
VAX/vax630_sysdev.c
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@ -542,10 +542,23 @@ return SCPE_OK;
/* NVR attach */
/* Valid NVRAM contents are required for the Boot ROM to respect the
watch chip's CSRD VRT bit. This empty NVRAM image avoids inconsistent
ROM behavior the first time the NVR device is attached (to an empty
file). Attaching a already existing file will overwrite this initial
contents with whatever the NVRAM file contains. */
uint8 nvr_empty_valid[NVRSIZE] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00,
0x00, 0x00, 0x00, 0xFE, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE,
0xFF, 0x00, 0x00, 0xFE, 0xFF, 0x00, 0x48, 0x45, 0x41, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
t_stat nvr_attach (UNIT *uptr, char *cptr)
{
t_stat r;
memcpy (nvr, nvr_empty_valid, NVRSIZE);
uptr->flags = uptr->flags | (UNIT_ATTABLE | UNIT_BUFABLE);
r = attach_unit (uptr, cptr);
if (r != SCPE_OK)