From 4a7a2c0c1d1e30fba348f8ee1534c9e1ead5f34c Mon Sep 17 00:00:00 2001 From: Luke Kenneth Casson Leighton Date: Sat, 9 May 2020 00:11:08 +0100 Subject: [PATCH] whitespace, add link from jacob on linux requirements --- 180nm_Oct2020/interfaces.mdwn | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/180nm_Oct2020/interfaces.mdwn b/180nm_Oct2020/interfaces.mdwn index f008a23fe..5bf6d96af 100644 --- a/180nm_Oct2020/interfaces.mdwn +++ b/180nm_Oct2020/interfaces.mdwn @@ -23,9 +23,23 @@ Under consideration: # Secondary priorities * a pinmux -* USB - again doable with LiteX. I'm talking to Enjoy Digital about what USB PHYs LiteX supports. - Yehowshua -* SERDES for Ethernet - using LiteX and [Marvell PHY](https://www.mouser.com/ProductDetail/Marvell/88E1512-A0-NNP2I000?qs=vdi0iO8H4N0XzuXqBRxTqg%3D%3D) -* Noting that a SERDES to RGMII PHY is $20(kinda expensive for total cost of an SBC), we can instead do Eth over USB like the original RPI. This moves the complexity to software - could make doing eth things during boot loader a little more complex. +* USB - again doable with LiteX. I'm talking to Enjoy Digital about what + USB PHYs LiteX supports. - Yehowshua +* SERDES for Ethernet - using LiteX and + [Marvell PHY](https://www.mouser.com/ProductDetail/Marvell/88E1512-A0-NNP2I000?qs=vdi0iO8H4N0XzuXqBRxTqg%3D%3D) +* Noting that a SERDES to RGMII PHY is $20 (kinda expensive for total cost + of an SBC), we can instead do Eth over USB like the original RPI. This + moves the complexity to software - could make doing eth things during + boot loader a little more complex. + +Jacob notes: + +I haven't checked but I'm 99% sure that we will need to implement standard +Power atomics, fences, ll/sc (including 128-bit version), cache flushes, +and non-cacheable load/store operations if we want to support Linux on our +october test chip. + + ## Alternate USB Interface Options - https://github.com/im-tomu/valentyusb -- 2.30.2