diff options
| -rw-r--r-- | board/logicpd/omap3som/README | 43 | ||||
| -rw-r--r-- | board/logicpd/omap3som/omap3logic.c | 41 |
2 files changed, 84 insertions, 0 deletions
diff --git a/board/logicpd/omap3som/README b/board/logicpd/omap3som/README index 06b3998ac0..b77b3d63db 100644 --- a/board/logicpd/omap3som/README +++ b/board/logicpd/omap3som/README @@ -17,3 +17,46 @@ This step is optional, but should you want to change the default to the SOM-LV, make distclean make omap3_logic_defconfig +Falcon Mode: FAT SD cards +========================= + +In this case the additional file is written to the filesystem. In this +example we assume that the uImage and device tree to be used are already on +the FAT filesystem (only the uImage MUST be for this to function +afterwards) along with a Falcon Mode aware MLO and the FAT partition has +already been created and marked bootable: + +U-Boot # mmc rescan +# Load kernel and device tree into memory, perform export +U-Boot # fatload mmc 0 ${loadaddr} uImage +U-Boot # run loadfdt +U-Boot # setenv optargs quiet +U-Boot # run mmcargs +U-Boot # run common_bootargs +U-Boot # spl export fdt ${loadaddr} - ${fdtaddr} + +This will print a number of lines and then end with something like: + Loading Device Tree to 8dec9000, end 8dee0295 ... OK + +So then note the starting address and write the args to mmc/sd: + +U-Boot # fatwrite mmc 0:1 0x8dec9000 args 0x20000 + +The size of 0x20000 matches the CMD_SPL_WRITE_SIZE. + +Falcon Mode: NAND +================= + +In this case the additional data is written to another partition of the +NAND. In this example we assume that the uImage and device tree to be are +already located on the NAND somewhere (such as filesystem or mtd partition) +along with a Falcon Mode aware MLO written to the correct locations for +booting and mtdparts have been configured correctly for the board: + +U-Boot # nand read ${loadaddr} kernel +U-Boot # load nand rootfs ${fdtaddr} /boot/am335x-evm.dtb +U-Boot # run nandargs +U-Boot # run common_bootargs +U-Boot # spl export fdt ${loadaddr} - ${fdtaddr} +U-Boot # nand erase.part u-boot-spl-os +U-Boot # nand write ${fdtaddr} u-boot-spl-os diff --git a/board/logicpd/omap3som/omap3logic.c b/board/logicpd/omap3som/omap3logic.c index cebb200c5f..b30fa24a32 100644 --- a/board/logicpd/omap3som/omap3logic.c +++ b/board/logicpd/omap3som/omap3logic.c @@ -114,6 +114,47 @@ void get_board_mem_timings(struct board_sdrc_timings *timings) timings->ctrlb = MICRON_V_ACTIMB_200; timings->rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_200MHz; } + +#define GPMC_NAND_COMMAND_0 (OMAP34XX_GPMC_BASE + 0x7c) +#define GPMC_NAND_DATA_0 (OMAP34XX_GPMC_BASE + 0x84) +#define GPMC_NAND_ADDRESS_0 (OMAP34XX_GPMC_BASE + 0x80) + +void spl_board_prepare_for_linux(void) +{ + /* The Micron NAND starts locked which + * prohibits mounting the NAND as RW + * The following commands are what unlocks + * the NAND to become RW Falcon Mode does not + * have as many smarts as U-Boot, but Logic PD + * only makes NAND with 512MB so these hard coded + * values should work for all current models + */ + + writeb(0x70, GPMC_NAND_COMMAND_0); + writeb(-1, GPMC_NAND_DATA_0); + writeb(0x7a, GPMC_NAND_COMMAND_0); + writeb(0x00, GPMC_NAND_ADDRESS_0); + writeb(0x00, GPMC_NAND_ADDRESS_0); + writeb(0x00, GPMC_NAND_ADDRESS_0); + writeb(-1, GPMC_NAND_COMMAND_0); + + /* Begin address 0 */ + writeb(NAND_CMD_UNLOCK1, 0x6e00007c); + writeb(0x00, GPMC_NAND_ADDRESS_0); + writeb(0x00, GPMC_NAND_ADDRESS_0); + writeb(0x00, GPMC_NAND_ADDRESS_0); + writeb(-1, GPMC_NAND_DATA_0); + + /* Ending address at the end of Flash */ + writeb(NAND_CMD_UNLOCK2, GPMC_NAND_COMMAND_0); + writeb(0xc0, GPMC_NAND_ADDRESS_0); + writeb(0xff, GPMC_NAND_ADDRESS_0); + writeb(0x03, GPMC_NAND_ADDRESS_0); + writeb(-1, GPMC_NAND_DATA_0); + writeb(0x79, GPMC_NAND_COMMAND_0); + writeb(-1, GPMC_NAND_DATA_0); + writeb(-1, GPMC_NAND_DATA_0); +} #endif #ifdef CONFIG_USB_MUSB_OMAP2PLUS |