Only BSP CPU writes CMOS in bootblock code
CMOS accesses are not safe for multi-processor and only the BSP CPU should count reboots and test CMOS sanity. A questionable single byte CMOS read access from AP CPUs remains. AP CPUs should always select the same romstage prefix as BSP CPU. Change-Id: I29118e33c07c0080c94abb90f703e38312c72432 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: http://review.coreboot.org/446 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
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@ -3,18 +3,28 @@
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static void main(unsigned long bist)
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{
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unsigned long entry;
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int boot_mode;
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if (boot_cpu()) {
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bootblock_northbridge_init();
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bootblock_southbridge_init();
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bootblock_cpu_init();
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}
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#if CONFIG_USE_OPTION_TABLE
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sanitize_cmos();
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sanitize_cmos();
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#endif
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boot_mode = do_normal_boot();
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} else {
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unsigned long entry;
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if (do_normal_boot())
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/* Questionable single byte read from CMOS.
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* Do not add any other CMOS access in the
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* bootblock for AP CPUs.
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*/
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boot_mode = last_boot_normal();
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}
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if (boot_mode)
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entry = findstage("normal/romstage");
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else
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entry = findstage("fallback/romstage");
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@ -6,11 +6,11 @@ static void main(unsigned long bist)
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bootblock_northbridge_init();
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bootblock_southbridge_init();
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bootblock_cpu_init();
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}
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#if CONFIG_USE_OPTION_TABLE
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sanitize_cmos();
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sanitize_cmos();
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#endif
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}
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const char* target1 = "fallback/romstage";
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unsigned long entry;
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