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iPod Classic: add non-cached memory region

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Configures uncached memory region and adds some defines for misc HW,
for compability with the bootloader and other future use, current
functionality should not be affected.

Change-Id: I390e79bea1aef5b10dfbc72ad327d7fe438ec6f5
This commit is contained in:
Cástor Muñoz 2015-12-17 02:37:18 +01:00
parent 348bfc5c8f
commit 00bda90a21
4 changed files with 95 additions and 66 deletions
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21
firmware/target/arm/s5l8702/system-s5l8702.c
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@ -168,7 +168,7 @@ void irq_handler(void)
irqvector[current_irq]();
VIC0ADDRESS = NULL;
VIC1ADDRESS = NULL;
asm volatile( "add sp, sp, #8 \n" /* Cleanup stack */
"ldmfd sp!, {r0-r7, ip, lr} \n" /* Restore context */
"subs pc, lr, #4 \n"); /* Return from IRQ */
@ -258,3 +258,22 @@ void set_cpu_frequency(long frequency)
cpu_frequency = frequency;
}
#endif
static void set_page_tables(void)
{
/* map RAM to itself and enable caching for it */
map_section(0, 0, 0x380, CACHE_ALL);
/* disable caching for I/O area */
map_section(0x38000000, 0x38000000, 0x80, CACHE_NONE);
/* map RAM uncached addresses */
map_section(0, S5L8702_UNCACHED_ADDR(0x0), 0x380, CACHE_NONE);
}
void memory_init(void)
{
ttb_init();
set_page_tables();
enable_mmu();
}