From: lkcl Date: Thu, 5 May 2022 15:24:22 +0000 (+0100) Subject: (no commit message) X-Git-Tag: opf_rfc_ls005_v1~2443 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a0e03dcb723043dd9fd0477d1bfdeade7735e86f;p=libreriscv.git --- diff --git a/openpower/sv/SimpleV_rationale.mdwn b/openpower/sv/SimpleV_rationale.mdwn index cf6851669..735c6c4d0 100644 --- a/openpower/sv/SimpleV_rationale.mdwn +++ b/openpower/sv/SimpleV_rationale.mdwn @@ -114,4 +114,19 @@ candidates for further advancement are: * RISC-V, touted as "Open" but actually strictly controlled under Trademark License: too new to have adequate patent pool protection, as evidenced by multiple adopters having been hit by patent lawsuits. -* +* MIPS, SPARC, ARC, and others, simply have no viable ecosystem. +* Power ISA: protected by IBM's extensive patent portfolio for Members + of the OpenPOWER Foundation, covered by Trademarks, permitting + and encouraging contributions, and having software support for over + 20 years. +* ARM, not permitting Open Licensing, they survived in the early 90s + only by doing a deal with Samsung for a Royalty-free License in exchange + for GBP 3 million and legal protection under Samsung Research Division. + Several large Corporations (Apple most notably) have licensed the ISA + but not ARM designs, the barrier to entry is high and the ISA itself + protected from interference as a result. +* x86, famous for a Court Ruling in 2004 where a Judge "banged heads + together" and ordered AMD and Intel to stop wasting his time, + make peace, and cross-license each other's patents, anyone wishing + to use the x86 ISA need only look at Transmeta, SiS, the Vortex x86, + and VIA EDEN processors, and see how they fared.