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sim/erc32: Perform pseudo-init if binary linked to non-zero address.

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Binaries produced by most erc32 tool-chains do not include
system initialization. sis will detect this and initialize
necessary registers for memory and timer control.
This commit is contained in:
Jiri Gaisler
2015-02-19 23:31:21 +01:00
committed by Mike Frysinger
parent df9bc4163b
commit 20a0ffe33a
4 changed files with 37 additions and 0 deletions
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24
sim/erc32/erc32.c
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@@ -743,6 +743,14 @@ mec_read(addr, asi, data)
*data = read_uart(addr);
break;
case 0xF4: /* simulator RAM size in bytes */
*data = 4096*1024;
break;
case 0xF8: /* simulator ROM size in bytes */
*data = 1024*1024;
break;
default:
set_sfsr(MEC_ACC, addr, asi, 1);
return (1);
@@ -1887,3 +1895,19 @@ sis_memory_read(addr, data, length)
memcpy(data, mem, length);
return (length);
}
extern struct pstate sregs;
void
boot_init (void)
{
mec_write(MEC_WCR, 0); /* zero waitstates */
mec_write(MEC_TRAPD, 0); /* turn off watch-dog */
mec_write(MEC_RTC_SCALER, sregs.freq - 1); /* generate 1 MHz RTC tick */
mec_write(MEC_MEMCFG, (3 << 18) | (4 << 10)); /* 1 MB ROM, 4 MB RAM */
sregs.wim = 2;
sregs.psr = 0x110010e0;
sregs.r[30] = RAM_END;
sregs.r[14] = sregs.r[30] - 96 * 4;
mec_mcr |= 1; /* power-down enabled */
}