diff options
Diffstat (limited to 'target/linux/ath79/image/lzma-loader/src/head.S')
| -rw-r--r-- | target/linux/ath79/image/lzma-loader/src/head.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/target/linux/ath79/image/lzma-loader/src/head.S b/target/linux/ath79/image/lzma-loader/src/head.S index 47a7c9bd63..d414b14d11 100644 --- a/target/linux/ath79/image/lzma-loader/src/head.S +++ b/target/linux/ath79/image/lzma-loader/src/head.S @@ -42,6 +42,19 @@ LEAF(startup) mtc0 t0, CP0_STATUS ehb + /* + * Some bootloaders set the 'Kseg0 coherency algorithm' to + * 'Cacheable, noncoherent, write-through, no write allocate' + * and this cause performance issues. Let's go and change it to + * 'Cacheable, noncoherent, write-back, write allocate' + */ + mfc0 t0, CP0_CONFIG + li t1, ~7 #~CONF_CM_CMASK + and t0, t1 + ori t0, 3 #CONF_CM_CACHABLE_NONCOHERENT + mtc0 t0, CP0_CONFIG + nop + mtc0 zero, CP0_COUNT mtc0 zero, CP0_COMPARE ehb |