This is useful to make sure no stale data exists in caches after bootloaders. The worst thing could be some lines of cache were locked in a bootloader for example during DDR recalibration and never unlocked. This may lead to really unpredictable issues later down the line. Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com> --- arch/arc/kernel/head.S | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S index 8b90d25a15cc..04e28b664183 100644 --- a/arch/arc/kernel/head.S +++ b/arch/arc/kernel/head.S @@ -34,6 +34,10 @@ #endif sr r5, [ARC_REG_IC_CTRL] + ; Invalidate entire I$ + mov r5, 1 + sr r5, [ARC_REG_IC_IVIC] + 1: lr r5, [ARC_REG_DC_BCR] breq r5, 0, 1f ; D$ doesn't exist @@ -46,6 +50,18 @@ #endif sr r5, [ARC_REG_DC_CTRL] + ; Flush entire D$ + mov r5, 1 + sr r5, [ARC_REG_DC_FLSH] + ; Wait for flush operation to complete +1: + lr r5, [ARC_REG_DC_CTRL] + bbit1 r5, DC_CTRL_FLUSH_STATUS, 1b + + ; Invalidate entire D$ + mov r5, 1 + sr r5, [ARC_REG_DC_IVDC] + 1: .endm -- 2.11.0
