[U-Boot] [PATCH 10/13] sunxi: Make the fastboot buffer larger

[Maxime Ripard]

Hi,

On Mon, Aug 31, 2015 at 05:01:42PM +0200, Hans de Goede wrote:
> On 31-08-15 16:46, Maxime Ripard wrote:
> >When using fastboot and flashing a larger image such as the main partition
> >of a system, the current 32MB limit for the buffer is quite small.
> >
> >Increase it to something that looks decent for such a use case.
> >
> >Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> >---
> >  include/configs/sunxi-common.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
> >index 1abf73c31179..710521c617f5 100644
> >--- a/include/configs/sunxi-common.h
> >+++ b/include/configs/sunxi-common.h
> >@@ -363,7 +363,7 @@ extern int soft_i2c_gpio_scl;
> >  #ifdef CONFIG_USB_FUNCTION_FASTBOOT
> >  #define CONFIG_CMD_FASTBOOT
> >  #define CONFIG_FASTBOOT_BUF_ADDR	CONFIG_SYS_LOAD_ADDR
> >-#define CONFIG_FASTBOOT_BUF_SIZE	0x2000000
> >+#define CONFIG_FASTBOOT_BUF_SIZE	(256 << 20)
> 
> Hmm, where / how does this get allocated? On some boards we only
> have 256M RAM, so this is not going to fit ... also if this comes
> out of the heap, the current heap is only 4M and the wip sunxi
> nand patches boost it to 64 (I still need to verify this works on
> a 256M board, this may need a tweak to bootm_size to make sure
> the bootm code does not try to put the kernel where it conflicts
> with the heap ...).

It's not allocated, it just uses the RAM directly, starting at the
offset CONFIG_FASTBOOT_BUF_ADDR (0x42000000 in our case), just like
any *load function for example.

The only thing we have to make sure is that we won't overwrite U-boot
itself, which will be an issue on those 256MB boards...

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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