[U-Boot] [PATCH V2 3/7] Add memory test feature for mpc85xx POST.
Wolfgang Denk
wd at denx.de
Tue Sep 28 19:38:40 CEST 2010
Dear York Sun,
In message <1285691891-32700-3-git-send-email-yorksun at freescale.com> you wrote:
> The memory test is performed after DDR initialization when U-boot stills runs
> in flash and cache. Whole memory can be tested. It is mapped 2GB at a time
> using a sliding TLB window. After the testing, DDR is remapped with up to 2GB
> memory from the lowest address as normal.
>
> If memory test fails, DDR DIMM SPD and DDR controller registers are dumped.
>
> Signed-off-by: York Sun <yorksun at freescale.com>
Please see previous comments about empty lines etc. to make to code
more readable.
Also, please add some comments to explain what you are actually doing.
> +Memory testing options for mpc85xx
> +==================================
> +1. Memory test can be done one U-boot prompt comes up using mtest, or
s/one/once/ ?
> +2. Memory test can be done with Power-On-Self-Test function, activated at compile time.
> +
> + In order to enable the POST memory test, CONFIG_POST needs to be
> + defined in board configuraiton header file. By default, POST memory test performs
> + a fast test. A slow test can be enabled by changing the flag at compiling time.
> + To test memory bigger than 2GB, 36BIT support is needed. Memory is tested within
> + a 2GB window. TLBs are used to map the virtual 2GB window to physical address
> + so that all physical memory can be tested.
Lines too long.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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