On Fri, May 25, 2018 at 8:47 PM, Udit Kumar udit.kumar@nxp.com wrote:
-----Original Message----- From: Rob Herring [mailto:robherring2@gmail.com] Sent: Friday, May 25, 2018 8:18 PM To: Udit Kumar udit.kumar@nxp.com Cc: Architecture Mailman List boot-architecture@lists.linaro.org; nd@arm.com; arm.ebbr-discuss@arm.com Subject: Re: Issue#9 Document hardware need (if any)
On Fri, May 25, 2018 at 1:44 AM, Udit Kumar udit.kumar@nxp.com wrote:
Hi At present, I don't see any specific hardware requirement for EBBR except
ARMv8 CPU. Current document covers it very well.
You have to have block storage. Perhaps UEFI implies that. Boards like the CHIP only have raw NAND and a USB connector by default. So is USB MS enough?
Yes but such need is not must to have EBBR running.
I don't follow.
I think being explicit with h/w requirements implied by UEFI would be a good thing. If I'm designing a board, I don't want to have to sort thru UEFI specs to distill down a bullet list of h/w reqs.
I like to cover here, all on/off chip components could be IP/peripherals needed for EBBR. Like if USB is present, minimum version of xchi or echi needs to be supported by hardware.
One look at XHCI or EHCI drivers and the variations across SoCs will tell you that just specifying those specs is pointless. But it is probably worth saying something about USB. Perhaps saying USB host port(s) (more than 1?) required and the firmware must support booting from USB.
Rob