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i.MX28: Add function to adjust memory parameters 

This function can be overridden at run-time and allows implementors
of new boards based on the i.MX28 chip to fine-tune the memory params.
It is possible to write into the dram_vals array because when the SPL
runs, it is located SRAM. Therefore the location is writable. There is
no possibility of these data to be read-only.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Marek Vasut 2012-05-29 19:43:13 +00:00 committed by Albert ARIBAUD
parent eeacb73b8e
commit e3ddc64603
1 changed files with 8 additions and 0 deletions
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8
arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
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@ -82,10 +82,18 @@ uint32_t dram_vals[] = {
0x00000000, 0x00010001
};
void __mx28_adjust_memory_params(uint32_t *dram_vals)
{
}
void mx28_adjust_memory_params(uint32_t *dram_vals)
__attribute__((weak, alias("__mx28_adjust_memory_params")));
void init_m28_200mhz_ddr2(void)
{
int i;
mx28_adjust_memory_params(dram_vals);
for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
}