On Tue, 2011-11-22 at 06:30 +0900, Stefan Reinauer wrote:
On 11/22/11 5:20 AM, Kyösti Mälkki wrote:
Hi
Could someone explain the use of boot_cpu() in bootblock_normal.c main()? I thought only the BSP CPU executes this code (currently)?
I am about to push a change that does early SMP init for hyper-threading CPUs to allow cache-as-ram implementation. Shared cache remains disabled until both/all logical CPUs enable it.
For some CPUs types (like AMD K8) all CPUs / cores start running the reset vector code after power-on.
Stefan
Do the BSP CPU and/or AP CPUs execute bootblock_normal: main() and mainboard/romstage: cache_as_ram_main() in parallel then?
Remember there are no semaphores for shared resources like CMOS_BOOT_BYTE in do_normal_boot() nor any spinlocks for pci_write_config() etc.
Kyösti