On Wed, Apr 05, 2023 at 06:47:58AM +0000, Emmanuel Dreyfus wrote: > On Tue, Apr 04, 2023 at 09:04:02PM +0200, Joerg Sonnenberger wrote: > > Look for beep_on_reset in the ACPI wake code. If your machine has a PC > > speaker emulated, that might be the easiest option: > > This is brilliant! > > I moved the beep code at various places in startprog64 in > src/sys/arch/i386/stand/efiboot/bootx64/startprog64.S > > Bootstrap code looses ground on rep movsq or rep movsb > instructions. The beep code before the string copy > produces sound, it does not if inserted after the string > copy. > > startprog64 contains 5 flavor of kernel copy, each using > string copy: > - aligned copy forward > - misaligned copy forward > - aligned copy backward > - byte by byte copy forward (with rep movsb) > - byte by byte copy backward (with rep movsb) > > Forcing code path to use any of them produces the same > issue: loose control on rep movs[qb].
Curious: have you tried any other OSes? memtest? Another unlikely thing comes to mind: What's your CPU? Do you have the latest available BIOS? I happen to know - and have tripped over - the fact that there have been various errata from Intel surrounding "rep movs", resulting in interesting behaviours. Can you try changing the code to a plain copy loop without a "rep" prefix? -- Paul Ripke "Great minds discuss ideas, average minds discuss events, small minds discuss people." -- Disputed: Often attributed to Eleanor Roosevelt. 1948.
