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core/riscv-rv32i: enable software ctz 

Because we don't support risc-v bit manipulation extension
(CLZ/CTZ instructions) yet, so we enable the software
implementation to fix build error while __ctzsi2 is called.

BUG=none
BRANCH=none
TEST=no build error.

Change-Id: If916010b9004f95aa4ccfd533be9539aff4c3f50
Signed-off-by: Dino Li <Dino.Li@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1982295
Reviewed-by: Jett Rink <jettrink@chromium.org>
This commit is contained in:
Dino Li 2020-01-16 16:23:18 +08:00 committed by Commit Bot
parent 739c21d178
commit 5e2d7361a6
1 changed files with 5 additions and 0 deletions
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5
core/riscv-rv32i/config_core.h
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@ -10,7 +10,12 @@
#define BFD_ARCH riscv
#define BFD_FORMAT "elf32-littleriscv"
/*
* The hardware doesn't support the risc-v bit manipulation
* extension (CLZ/CTZ instructions) so let's use the software implementation.
*/
#define CONFIG_SOFTWARE_CLZ
#define CONFIG_SOFTWARE_CTZ
#define CONFIG_SOFTWARE_PANIC
#endif /* __CROS_EC_CONFIG_CORE_H */