On Tue, Jul 22, 2014 at 04:03:20PM +0530, pekon gupta wrote: > Beaglebone Board can be connected to expansion boards to add devices to them. > These expansion boards are called 'capes'. This patch adds support for > following versions of Beaglebone(AM335x) NAND capes > (a) NAND Device with bus-width=16, block-size=128k, page-size=2k, oob-size=64 > (b) NAND Device with bus-width=16, block-size=256k, page-size=4k, oob-size=224 > Further information and datasheets can be found at [1] and [2] > > * How to boot from NAND using Memory Expander + NAND Cape ? * > - Important: As BOOTSEL values are sampled only at POR, so after changing any > setting on SW2 (DIP switch), disconnect and reconnect all board power > supply > (including mini-USB console port) to POR the beaglebone. > > - Selection of ECC scheme > for NAND cape(a), ROM code expects BCH8_HW ecc-scheme > for NAND cape(b), ROM code expects BCH16_HW ecc-scheme > > - Selction of boot modes can be controlled via DIP switch(SW2) present on > Memory Expander cape. > SW2[SWITCH_BOOT] == OFF follow default boot order MMC-> SPI -> UART -> > USB > SW2[SWITCH_BOOT] == ON boot mode selected via DIP switch(SW2) > So to flash NAND, first boot via MMC or other sources and then switch to > SW2[SWITCH_BOOT]=ON to boot from NAND Cape. > > - For NAND boot following switch settings need to be followed > SW2[ 1] = OFF (SYSBOOT[ 0]==1: NAND boot mode selected ) > SW2[ 2] = OFF (SYSBOOT[ 1]==1: -- do -- ) > SW2[ 3] = ON (SYSBOOT[ 2]==0: -- do -- ) > SW2[ 4] = ON (SYSBOOT[ 3]==0: -- do -- ) > SW2[ 5] = OFF (SYSBOOT[ 4]==1: -- do -- ) > SW2[ 6] = OFF (SYSBOOT[ 8]==1: 0:x8 device, 1:x16 device ) > SW2[ 7] = ON (SYSBOOT[ 9]==0: ECC done by ROM ) > SW2[ 8] = ON (SYSBOOT[10]==0: Non Muxed device ) > SW2[ 9] = ON (SYSBOOT[11]==0: -- do -- ) > > [1] http://beagleboardtoys.info/index.php?title=BeagleBone_Memory_Expansion > [2] > http://beagleboardtoys.info/index.php?title=BeagleBone_4Gb_16-Bit_NAND_Module > > *IMPORTANT NOTE* > As Beaglebone board shares the same config as AM335x EVM, so following > changes are required in addition to this patch for Beaglebone NAND cape. > (1) Enable NAND in am335x_beaglebone board profile > (2) Add CONFIG_SYS_NAND_BUSWIDTH_16BIT to board config because: > - AM335x EVM has NAND device with datawidth=8, whereas > - Beaglebone NAND cape has NAND device with data-width=16 > > diff --git a/boards.cfg b/boards.cfg > -Active arm armv7 am33xx ti am335x > am335x_boneblack > am335x_evm:SERIAL1,CONS_INDEX=1,EMMC_BOOT > Tom Rini <[email protected]> > +Active arm armv7 am33xx ti am335x > am335x_boneblack > am335x_evm:SERIAL1,CONS_INDEX=1,NAND > Tom Rini <[email protected]> > > diff --git a/include/configs/am335x_evm.h b/include/configs/am335x_evm.h > +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT > > Signed-off-by: Pekon Gupta <[email protected]>
Applied to u-boot-ti/master, thanks! -- Tom
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