diff options
| author | imp <imp@FreeBSD.org> | 2006-04-13 17:39:34 +0000 |
|---|---|---|
| committer | imp <imp@FreeBSD.org> | 2006-04-13 17:39:34 +0000 |
| commit | 3419654b4d66a16259065519d1dd7d8b9012ba92 (patch) | |
| tree | 11aa3ca1f6d7f37c38e331e93d32c3aa34588583 /sys/boot/arm/at91 | |
| parent | 79ad9cfabd0e2f21e129115db463e0e983c3a8d9 (diff) | |
| download | FreeBSD-src-3419654b4d66a16259065519d1dd7d8b9012ba92.zip FreeBSD-src-3419654b4d66a16259065519d1dd7d8b9012ba92.tar.gz | |
MFp4:
For 32-bit SDRAM systems, enable D16 to D31 in the PIO controller.
Otherwise they read back as 0xffff.
Shave 8 bytes from the object size by using AT91C_BASE_PIOA directly
and by not assigning PIO_BSR to 0 in the DBGU init. That's a nop in
two ways (everything defaults to peripheral A, and writing 0 changes
nothing).
Diffstat (limited to 'sys/boot/arm/at91')
| -rw-r--r-- | sys/boot/arm/at91/boot0/at91rm9200_lowlevel.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/sys/boot/arm/at91/boot0/at91rm9200_lowlevel.c b/sys/boot/arm/at91/boot0/at91rm9200_lowlevel.c index ab3ae24..d0f10a1 100644 --- a/sys/boot/arm/at91/boot0/at91rm9200_lowlevel.c +++ b/sys/boot/arm/at91/boot0/at91rm9200_lowlevel.c @@ -44,7 +44,6 @@ _init(void) { AT91PS_USART pUSART = (AT91PS_USART)AT91C_BASE_DBGU; AT91PS_PDC pPDC = (AT91PS_PDC)&(pUSART->US_RPR); - AT91PS_PIO pPio = AT91C_BASE_PIOA; register unsigned value; int i; @@ -152,10 +151,14 @@ _init(void) AT91C_BASE_SDRC->SDRC_MR = SDRAM_WIDTH | AT91C_SDRC_MODE_NORMAL_CMD; *p = 0; +#if SDRAM_WIDTH == AT91C_SDRC_DBW_32_BITS + // Turn on the upper 16 bits on the SDRAM bus. + AT91C_BASE_PIOC->PIO_ASR = 0xffff0000; + AT91C_BASE_PIOC->PIO_PDR = 0xffff0000; +#endif // Configure DBGU -use local routine optimized for space - pPio->PIO_ASR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; - pPio->PIO_BSR = 0; - pPio->PIO_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; + AT91C_BASE_PIOA->PIO_ASR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; + AT91C_BASE_PIOA->PIO_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; pUSART->US_IDR = (unsigned int) -1; pUSART->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RXDIS | AT91C_US_TXDIS; |
