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authorWu Zhangjin <wuzhangjin@gmail.com>2010-04-10 20:04:42 +0800
committerRalf Baechle <ralf@linux-mips.org>2010-04-30 20:52:56 +0100
commit622844bf0b4cfa4f76d4a0ddc44266938385f5ab (patch)
tree52d7ab361091614b4815076003555819d56efd03 /REPORTING-BUGS
parentc619366e36aa75beaaee630f3d6e468422ed9530 (diff)
MIPS: Loongson: Add CPU_LOONGSON2F_WORKAROUNDS
As documented in the Loongson 2F User Manual [2, 3], the old Loongson2F series (2F01 / 2F02) have the NOP & JUMP issues which requires workarounds in the kernel and binutils. This issue has been rectified in Loongson 2F series 2F03 so no workarounds needed. Now that the workarounds [1] adding the the -mfix-loongson2f-nop and -mfix-loongson2f-jump options have been comitted to the binutils the CVS repository), we can add the workarounds in the kernel. The workarounds have no significant side effect on the system but may decrease performance so we control them through a a new CPU_LOONGSON2F_WORKAROUNDS config option allowing the users to only enable it as necessary. [1] "Fixups of Loongson2F" patch for binutils(actually for gas) http://sourceware.org/ml/binutils/2009-11/msg00387.html [2] Chapter 15 of "Loongson2F User Manual"(Chinese Version) http://www.loongson.cn/uploadfile/file/200808211 [3] English Version of the above chapter 15 http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips <linux-mips@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/1105/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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