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mx23: Document the tRAS lockout setting in memory initialization

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Add a comment about the tRAS lockout setting of HW_DRAM_CTL08 to
enable the 'Fast Auto Pre-Charge' found in the memory chip. The
setting is applied after memory initialization and it is worth
document it.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
This commit is contained in:
Otavio Salvador 2013-02-23 02:43:05 +00:00 committed by Stefano Babic
parent a74dbf2734
commit 89075d3f4f
1 changed files with 4 additions and 0 deletions
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4
arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
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@ -120,6 +120,10 @@ static void initialize_dram_values(void)
writel(dram_vals[i], MXS_DRAM_BASE + (4 * i)); writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
#ifdef CONFIG_MX23 #ifdef CONFIG_MX23
/*
* Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
* element to be set
*/
writel((1 << 24), MXS_DRAM_BASE + (4 * 8)); writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
#endif #endif
} }