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* CXL_ECN_MailboxReadyTime
@ 2021-06-22  1:41 Dai WeiBin (David Dai)
  0 siblings, 0 replies; only message in thread
From: Dai WeiBin (David Dai) @ 2021-06-22  1:41 UTC (permalink / raw)
  To: linux-cxl

Hi,

When I think of CXL mailbox interface ready and timeout, an issue is troubling me:
From CXL_ECN_MailboxReadyTime_v5.pdf, Mailbox Ready Time could be at most 3 minutes, Host BIOS maybe not be able to endure such big timeout duration, so CXL device enumeration maybe fail during BIOS stage. CXL device maybe have huge memory which needs a lot of time for training, thus device boot-up will take a long period, for this case, a big delay maybe exist before mailbox ready. I think if mailbox function doesn't ready, BIOS should not refuse CXL device if other functions work well.

Thanks,
David





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