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ARC: Cache: Disable IOC by default
We'd like to keep IOC HW at the same state as t is right after reset when we start Linux kernel so there will be no re-configuration of IOC on the go. The point is U-Boot doesn't benefit a lot from IOC as it doesn't do a lot of DMA operations especially on multiple cores simultaneously. At the same time re-configuration of IOC in run-time might become quite a tricky experience because we need to make sure there're no DMA trannsactions in flight otherwise unexpected consequencses might affect us much later and debugging those kinds of issues will be a real nightmare. That said let's make our life easier a little bit. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
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1 changed files with 4 additions and 1 deletions
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@ -48,6 +48,9 @@ bool slc_exists __section(".data") = false;
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bool ioc_exists __section(".data") = false;
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bool pae_exists __section(".data") = false;
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/* To force enable IOC set ioc_enable to 'true' */
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bool ioc_enable __section(".data") = false;
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void read_decode_mmu_bcr(void)
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{
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/* TODO: should we compare mmu version from BCR and from CONFIG? */
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@ -200,7 +203,7 @@ static void read_decode_cache_bcr_arcv2(void)
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} cbcr;
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cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
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if (cbcr.fields.c)
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if (cbcr.fields.c && ioc_enable)
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ioc_exists = true;
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}
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#endif
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