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Sansa AMS: add a comment in sdram_init(), and use inline asm to set the SDRAM mode register

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21282 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2009-06-13 23:52:13 +00:00
parent 2bb7c422ea
commit 02a53fd809
1 changed files with 5 additions and 3 deletions
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8
firmware/target/arm/as3525/system-as3525.c
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@ -209,9 +209,11 @@ static void sdram_init(void)
MPMC_DYNAMIC_CONTROL = 0x82; /* SDRAM MODE, MPMCCLKOUT runs continuously */
/* this part is required, if you know why please explain */
unsigned int tmp = *(volatile unsigned int*)(0x30000000+0x2300*MEM);
(void)tmp; /* we just need to read from this location */
/* program the SDRAM mode register */
/* FIXME: details the exact settings of mode register */
asm volatile(
"ldr r4, [%0]\n"
: : "p"(0x30000000+0x2300*MEM) : "r4");
MPMC_DYNAMIC_CONTROL = 0x2; /* SDRAM NORMAL, MPMCCLKOUT runs continuously */