[U-Boot] [PATCH 0/1] Fix hang trying to protect flash sectors

[Stefan Roese <sr@denx.de>]

Hi Mark,

On Tuesday 18 May 2010 07:26:34 Mark Tomlinson wrote:
> Our hardware has part of the flash mapped in two address ranges.
> The CONFIG_SYS_MONITOR_BASE is in the upper 'boot' area, whereas
> the CONFIG_SYS_FLASH_BANKS_LIST has the full flash available at
> a lower address.

Just to be sure: You have 2 FLASH chips? Mapped at which addresses? And where 
does CONFIG_SYS_MONITOR_BASE point to?
 
> This all works fine until the code in cfi_flash.c:flash_init(), which
> uses flash_get_info() to find the flash_info_t associated with the
> monitor and environment. These are not in the probed flash range, so
> flash_get_info() returns NULL.

You mean that "flash_get_info(CONFIG_SYS_MONITOR_BASE)" returns NULL? Please 
explain again, why is this the case? 

> This is not checked and is passed
> directly to flash_protect(). Since flash_protect() was not checking
> for this NULL pointer either, random memory would be clobbered
> causing the device to lock up.
> 
> This patch changes flash_protect() to check for the NULL, and the
> error goes unreported.

I would prefer to fix the real problem, that flash_get_info() returns NULL, 
instead.
 
Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de