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ARM: omap3_logic: Enable NAND unlocking during Falcon mode

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Falcon mode was already working with SD card.  This enables the
unlocking of NAND to allow the NAND read & write.  This also
expands the README file based on the am335x describing how to
setup Falcon mode.

Signed-off-by: Adam Ford <aford173@gmail.com>
This commit is contained in:
Adam Ford 2017-12-04 17:54:50 -06:00 committed by Tom Rini
parent 157af4f81f
commit 6032c02947
2 changed files with 84 additions and 0 deletions
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43
board/logicpd/omap3som/README
View File

@ -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

41
board/logicpd/omap3som/omap3logic.c
View File

@ -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