diff options
| author | Wenyou Yang <wenyou.yang@microchip.com> | 2017-09-13 14:58:50 +0800 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2017-09-14 16:02:44 -0400 |
| commit | 23a19e03589c0b1c4daec082f33a1ecdbf5a4475 (patch) | |
| tree | ed8e76c277b06a93ea1eb708b6cd7288dc1c6e1b /board | |
| parent | 2b21cf55cc767bc1303f22c3f6f7b9d6f0845c02 (diff) | |
board: sama5d2_xplained: Make SPL work on spiflash
Because before switching to a lower clock source, we must switch
the clock source first instead of last. So before configuring the
PMC_MCKR register, invoke at91_mck_init_down() first.
As said in datasheet, the the size of SPL must not exceed the maximum
size allowed(64Kbytes).
Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'board')
| -rw-r--r-- | board/atmel/sama5d2_xplained/sama5d2_xplained.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/board/atmel/sama5d2_xplained/sama5d2_xplained.c b/board/atmel/sama5d2_xplained/sama5d2_xplained.c index 7e0cb4228f..5758653030 100644 --- a/board/atmel/sama5d2_xplained/sama5d2_xplained.c +++ b/board/atmel/sama5d2_xplained/sama5d2_xplained.c @@ -247,6 +247,16 @@ void at91_pmc_init(void) struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; u32 tmp; + /* + * while coming from the ROM code, we run on PLLA @ 492 MHz / 164 MHz + * so we need to slow down and configure MCKR accordingly. + * This is why we have a special flavor of the switching function. + */ + tmp = AT91_PMC_MCKR_PLLADIV_2 | + AT91_PMC_MCKR_MDIV_3 | + AT91_PMC_MCKR_CSS_MAIN; + at91_mck_init_down(tmp); + tmp = AT91_PMC_PLLAR_29 | AT91_PMC_PLLXR_PLLCOUNT(0x3f) | AT91_PMC_PLLXR_MUL(82) | |