[Libre-soc-bugs] [Bug 490] Complete peripheral set including litex for first functional POWER9 Core

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=490

--- Comment #21 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
i've redesigned litex GPIO and SD/MMC Card to have signals that
comprise "gpio_i", "gpio_o", "gpio_oe" and the same for sdcard
cmd and data.

this involves literally cut/pasting verbatim the entire litex GPIO
and SDCard classes, duplicating the code, and replacing the pinout
class with a suitable replacement.

it's a mess, and the same mess will extend to SDRAM.

FORTNUATELY, for SDRAM, the concept of alternative PHYs is an
established practice, so i "only" have to create a replacement
that munges the names of dq into triple-functions dq_i, dq_o, dq_en

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