Hi, Grant,
On Fri, Jan 28, 2011 at 3:57 PM, Jason Hui <jason....@linaro.org> wrote:
> Hi, Grant and Nico,
>
> On Fri, Jan 28, 2011 at 2:51 AM, Nicolas Pitre <nicolas.pi...@linaro.org>
> wrote:
>> On Thu, 27 Jan 2011, Grant Likely wrote:
>>
>>> 2011/1/26 Grant Likely <grant.lik...@secretlab.ca>:
>>> > On Wed, Jan 26, 2011 at 2:49 PM, Nicolas Pitre <nicolas.pi...@linaro.org>
>>> > wrote:
>>> >> On Wed, 26 Jan 2011, Grant Likely wrote:
>>> >>
>>> >>> If I were able to get all the supported Linaro platforms modified and
>>> >>> tested to support dt booting, would you be okay with picking up the
>>> >>> current dt support series and having CONFIG_OF turned on by default
>>> >>> for the next Linaro release? There are also some details to nail down
>>> >>> with respect to packaging the .dtb files, but I'm working out those
>>> >>> details with Loďc.
>>> >>
>>> >> May I ask you to create a linaro-2.6.37 branch in your repo based on
>>> >> git://git.linaro.org/kernel/linux-linaro-2.6.37.git and merge your DT
>>> >> branch in it? If the result look sane to you then I should be able to
>>> >> merge it in the current Linaro kernel for people to play with.
>>> >
>>> > Done. My branch is based on 2.6.38-rc1, so I cherry picked rather
>>> > than rebased. The first two commits are in Linus' tree, the remainder
>>> > are from devicetree/arm. You can find the result here:
>>>
>>> Oops, I've run into a bug. Hold off on this for the moment until I
>>> dig it out and squash it.
>>
>> No problem. I hadn't pushed it out yet.
>
> I have run into one problem when play with DT support on MX51, here is
> what I'm doing,
>
> - Enable CONFIG_OF_LIBFDT in u-boot and build for mx51evk,
>
> +#define CONFIG_OF_LIBFDT
> +#define CONFIG_SYS_BOOTMAPSZ 0x800000
>
> - Add mx51-dt.c in kernel to add mx51 dt probe and support,
>
> - Build the kernel and uboot, no problem,
>
> - run uboot with DT support, log as the followings,
>
> ## Booting kernel from Legacy Image at 90800000 ...
> Image Name: Linux-2.6.37-rc7+
> Image Type: ARM Linux Kernel Image (uncompressed)
> Data Size: 1866572 Bytes = 1.8 MiB
> Load Address: 90008000
> Entry Point: 90008000
> Verifying Checksum ... OK
> ## Flattened Device Tree blob at 90000000
> Booting using the fdt blob at 0x90000000
> Loading Kernel Image ... OK
> OK
> Loading Device Tree to 907fc000, end 907ff6f1 ... OK
>
> Starting kernel ...
>
> Uncompressing Linux... done, booting the kernel.
>
> No message output, but if print log_buf, here is the log information,
>
>> dump /W 0xC03B550C..0xC03B650C
> +0x0 +0x4 +0x8 +0xC
> ------------------------------------------------
> S:0xC03B5500 4C3E353C
> <5>L
> S:0xC03B5510 78756E69 72657620 6E6F6973 362E3220 inux version
> 2.6
> S:0xC03B5520 2D37332E 2B376372 36722820 33343334 .37-rc7+
> (r64343
> S:0xC03B5530 34367240 2D333433 6B736564 29706F74
> @r64343-desktop)
> S:0xC03B5540 63672820 65762063 6F697372 2E34206E (gcc version
> 4.
> S:0xC03B5550 20332E33 756F5328 72656372 2B472079 3.3 (Sourcery
> G+
> S:0xC03B5560 694C202B 32206574 71393030 30322D31 + Lite
> 2009q1-20
> S:0xC03B5570 29202933 20342320 20697246 206E614A 3) ) #4 Fri Jan
> S:0xC03B5580 31203832 30313A35 2031303A 20545343 28 15:10:01 CST
> S:0xC03B5590 31313032 3E343C0A 3A555043 4D524120 2011.<4>CPU:
> ARM
> S:0xC03B55A0 50203776 65636F72 726F7373 31345B20 v7 Processor
> [41
> S:0xC03B55B0 30636632 205D3538 69766572 6E6F6973 2fc085]
> revision
> S:0xC03B55C0 28203520 764D5241 202C2937 313D7263 5 (ARMv7),
> cr=1
> S:0xC03B55D0 33356330 0A663763 433E343C 203A5550 0c53c7f.<4>CPU:
> S:0xC03B55E0 54504956 6E6F6E20 61696C61 676E6973 VIPT
> nonaliasing
> S:0xC03B55F0 74616420 61632061 2C656863 50495620 data cache,
> VIP
> S:0xC03B5600 6C612054 69736169 6920676E 7274736E T aliasing
> instr
> S:0xC03B5610 69746375 63206E6F 65686361 0000000A uction
> cache....
>
> After narrow down the issue I found the error happen in the function,
>
> struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
> {
> struct boot_param_header *devtree;
> struct machine_desc *mdesc, *mdesc_best = NULL;
> unsigned int score, mdesc_score = ~1;
> unsigned long dt_root;
>
> devtree = phys_to_virt(dt_phys);
>
> .....
>
> here the dt_phys is 0,
I did the following modification, which make the basic DT support boot
up on MX51 board,
- Let uboot pass MACH_TYPE_DT to kernel via r1,
- Add the following patch to make sure DT blob is mapped by MMU
+#ifdef CONFIG_OF_FLATTREE*/
+ /* Make sure DT blob is mapped */
+ mov r0, r2
+ mov r0, r0, lsr #20
+ mov r0, r0, lsl #20
+ sub r3, r0, #PHYS_OFFSET
+ add r3, r3, #PAGE_OFFSET
+ add r3, r4, r3, lsr #18
+ orr r6, r7, r0
+ str r6, [r3]
+ add r6, r6, #0x100000
+ str r6, [r3, #4]
#ifdef CONFIG_DEBUG_LL
#ifndef CONFIG_DEBUG_ICEDCC
BR,
Jason Liu
>
>
>>
>>
>> Nicolas
>> _______________________________________________
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>> linaro-dev@lists.linaro.org
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>>
>>
>
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