Date: Fri, 22 Apr 2016 16:15:59 +0000 (UTC) From: Ruslan Bukin <br@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r298477 - in head/sys: conf riscv/riscv Message-ID: <201604221615.u3MGFxCM088374@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: br Date: Fri Apr 22 16:15:58 2016 New Revision: 298477 URL: https://svnweb.freebsd.org/changeset/base/298477 Log: Clear the DDR memory. This should be done by bootloaders, but they have no such feature yet. This fixes operation on Rocket Core and lowRISC. Modified: head/sys/conf/options.riscv head/sys/riscv/riscv/locore.S Modified: head/sys/conf/options.riscv ============================================================================== --- head/sys/conf/options.riscv Fri Apr 22 15:12:05 2016 (r298476) +++ head/sys/conf/options.riscv Fri Apr 22 16:15:58 2016 (r298477) @@ -2,3 +2,4 @@ RISCV opt_global.h VFP opt_global.h +DDR_CLEAR_SIZE opt_global.h Modified: head/sys/riscv/riscv/locore.S ============================================================================== --- head/sys/riscv/riscv/locore.S Fri Apr 22 15:12:05 2016 (r298476) +++ head/sys/riscv/riscv/locore.S Fri Apr 22 16:15:58 2016 (r298477) @@ -126,6 +126,17 @@ _start: csrr a0, mhartid bnez a0, mpentry +#if defined(DDR_CLEAR_SIZE) + /* Clear DDR memory */ + la t0, _end + li t1, DDR_CLEAR_SIZE +1: + sd zero, 0(t0) + addi t0, t0, 8 + bltu t0, t1, 1b + /* End */ +#endif + /* Build event queue for current core */ build_ring
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201604221615.u3MGFxCM088374>