[U-Boot] [PATCH 6/6] RFC: am335x: enable falcon boot mode for mmc (raw and fat)

[Peter Korsgaard]

>>>>> "Tom" == Tom Rini <trini at ti.com> writes:

 Tom> On Sun, Mar 24, 2013 at 10:51:33PM +0100, Peter Korsgaard wrote:
 >> Jump into full u-boot mode if a 'c' character is received on the uart.
 >> 
 >> We need to adjust the spl bss/malloc area to not overlap with the
 >> loadaddr of the kernel (sdram + 32k), so move it past u-boot instead.
 >> 
 >> Signed-off-by: Peter Korsgaard <peter.korsgaard at barco.com>
 Tom> [snip]
 >> +/* raw mmc */
 >> +#define CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR	0xa00 /* address 0xa0000 */
 >> +#define CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR	0x8   /* address 0x1000 */
 >> +#define CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS	8     /* 4KB */

 Tom> Did you also test raw mode?

Yes, I did. I'm personally most interested in raw mode because of the 4x
redundant MLO handling.


 Tom> Also, why 0xa00?  U-Boot is 0x300 -> 0x500,
 Tom> and one might say throw a redundant copy at 0x500 -> 0x700.  But we
 Tom> don't do 4 copy redundancy in U-Boot, just 2 usually.

No particular reason, 0x700 should work as well. As mentioned, this was
just a proof of concept to be able to test it.


 >> +/* dummy defines to keep spl_nand.c happy */
 >> +#define CONFIG_CMD_SPL_NAND_OFS			0
 >> +#define CONFIG_SYS_NAND_SPL_KERNEL_OFFS		0
 >> +#define CONFIG_CMD_SPL_WRITE_SIZE		0

 Tom> We should do some real defines here while at it, since the GP EVM has
 Tom> NAND :)

Yes. It's a bit unfortunate that CONFIG_SPL_OS_BOOT is a global setting,
so you need all the various falcon boot related defines even if you
don't plan on using them.

I can try to come up with sensible NAND values, but I don't have a EVM
to test.

-- 
Bye, Peter Korsgaard