Re: [linux-sunxi] Re: How to decide NAND boot address?

[Olliver Schinagl]

On 03/14/2014 04:42 PM, hunter hu wrote:

Hi,

OK, I think I need to close the topic and drew a conclusion:

The conclusion is: my board in question, which is an IView435TPC,
doesn't allow any hacking on NAND by doing something magic inside closed
source boot1.

The conclusion fis based on my following observations:

 1. I have tried Installing to NAND sunxi wiki instructions, it works
fine.  just git checkout lichee-dev, make the CONFIG_BOOTCOMMAND
changes with fatload inside include/configs/sun5i_a13.h, basically
that is the line we put inside boot.cmd for boot.scr.  No need to do
any dram configurations as we want to do in sd card boot case.

correct, dram is initialized by boot0/boot1

 2. when I was using nand-part tool to repartition the internal NAND,
the last re-read partition table command returns -1 on the iview
tablet, but return 0 on Olimex a13 board, which indicates something
is going on in the iview nand.
nand-part may simply not support the newer version of libnand used on 
this tablet

 3. I could see no debugging output from serial when hooking up with
UART1 on the iview, but everything is OK on Olimex NAND, I can see
boot0 loading messages, as well as lichee-dev uboot, and my uImage
output.
Closed blobs make you cry. You probably have an incompatible libnand. 
But fear not, the mtd driver is very slowly progressing. A year from now 
we might be thinking 'oh, heh, good riddens libnand is gone'.




So, the lesson learned here is for some of the commercial tablets out
there, they must have put some magic keys/encryptions to lock down their
internal NAND to prevent any hacking or manipulations, no debug output
from serial is a very good sign of such lock down.
You are the very first one that 'might' (unlikly) have a locked down 
nand. I sincerly doubt it's locked down at all.


Olliver


Hope these notes are helpful to someone, and my appreciations to all the
help from you guys.

Cheers,
-Hunter

On Friday, March 7, 2014 5:09:41 PM UTC-6, hunter hu wrote:

Hi,

I finally got the serial port working on my board, just a side note,
we need a pull up resistor at the Rx pin, and I am using UART1 with
SD card approach, anyone struggles with serial port, here is the
thread that helped me:
https://www.olimex.com/forum/index.php?topic=1788.0


All goes well with the SD u-boot and I can stop at u-boot prompt and
play with it, booting up as usual too by typing boot.

However when I set the NAND stuff up with lichee-dev u-boot built
out of sun5i_a13, there is no serial output at all upon boot and
stuck at logo, which indicates something is wrong with the u-boot
image and it didn't run as expected.

I also tried just use the stock android u-boot, some posts say we
can stop android u-boot when booting up, I didn't see that happen
either.

Any ideas how to proceed from here would be greatly appreciated.

Thanks in advance,
-Hunter



On Wednesday, March 5, 2014 10:13:45 PM UTC-6, hunter hu wrote:

Thanks Pat,

I have used the correct syntax, but still, stuck at the SUNXI
logo; at this moment I have a few questions:

1> my cpu is A13, your u-boot is for A20, I would think that is
not working for me?

2> I have been using lichee-dev, sun5i_a13 board, trying to
modify the configurations as shown before;  when I was adding my
board to the u-boot-sunxi, I had to add a dram_myboard.c to
configure the DRAM by following the sunxi wiki instructions, I
tried to do with and without the DRAM stuff, the same, stuck at
the logo, I believe I have to get the serial port working first.

Thank you very much for all help so far, I greatly appreciated.

-Hunter

On Wednesday, March 5, 2014 9:35:06 PM UTC-6, Patrick Wood wrote:

fatload nand 0 kernel_address kernel_file

Note that my u-boot is based on a heavily-modified version
of the one used by android.

On Wednesday, March 5, 2014 10:10:03 PM UTC-5, hunter hu wrote:

Hi Pat,

I was not be able to get serial port access yet, work in
progress.

Regarding the syntax, what are the correct ones?

thanks,
-Hunter

On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick
Wood wrote:

That's not the right syntax for file access. Don't
you have a serial port you can get boot logs from?

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Re: [linux-sunxi] Re: How to decide NAND boot address?

[hunter hu]

Hi,

OK, I think I need to close the topic and drew a conclusion:

The conclusion is: my board in question, which is an IView435TPC, doesn't 
allow any hacking on NAND by doing something magic inside closed source 
boot1.

The conclusion fis based on my following observations:


   1. I have tried Installing to NAND sunxi wiki instructions, it works 
   fine.  just git checkout lichee-dev, make the CONFIG_BOOTCOMMAND changes 
   with fatload inside include/configs/sun5i_a13.h, basically that is the line 
   we put inside boot.cmd for boot.scr.  No need to do any dram configurations 
   as we want to do in sd card boot case.
   2. when I was using nand-part tool to repartition the internal NAND, the 
   last re-read partition table command returns -1 on the iview tablet, but 
   return 0 on Olimex a13 board, which indicates something is going on in the 
   iview nand.
   3. I could see no debugging output from serial when hooking up with 
   UART1 on the iview, but everything is OK on Olimex NAND, I can see boot0 
   loading messages, as well as lichee-dev uboot, and my uImage output.

So, the lesson learned here is for some of the commercial tablets out 
there, they must have put some magic keys/encryptions to lock down their 
internal NAND to prevent any hacking or manipulations, no debug output from 
serial is a very good sign of such lock down.

Hope these notes are helpful to someone, and my appreciations to all the 
help from you guys.

Cheers,
-Hunter

On Friday, March 7, 2014 5:09:41 PM UTC-6, hunter hu wrote:
>
> Hi,
>
> I finally got the serial port working on my board, just a side note, we 
> need a pull up resistor at the Rx pin, and I am using UART1 with SD card 
> approach, anyone struggles with serial port, here is the thread that helped 
> me: https://www.olimex.com/forum/index.php?topic=1788.0
>
> All goes well with the SD u-boot and I can stop at u-boot prompt and play 
> with it, booting up as usual too by typing boot.
>
> However when I set the NAND stuff up with lichee-dev u-boot built out of 
> sun5i_a13, there is no serial output at all upon boot and stuck at logo, 
> which indicates something is wrong with the u-boot image and it didn't run 
> as expected.
>
> I also tried just use the stock android u-boot, some posts say we can stop 
> android u-boot when booting up, I didn't see that happen either.
>
> Any ideas how to proceed from here would be greatly appreciated.
>
> Thanks in advance,
> -Hunter
>
>
>
> On Wednesday, March 5, 2014 10:13:45 PM UTC-6, hunter hu wrote:
>>
>> Thanks Pat,
>>
>> I have used the correct syntax, but still, stuck at the SUNXI logo; at 
>> this moment I have a few questions:
>>
>> 1> my cpu is A13, your u-boot is for A20, I would think that is not 
>> working for me?
>>
>> 2> I have been using lichee-dev, sun5i_a13 board, trying to modify the 
>> configurations as shown before;  when I was adding my board to the 
>> u-boot-sunxi, I had to add a dram_myboard.c to configure the DRAM by 
>> following the sunxi wiki instructions, I tried to do with and without the 
>> DRAM stuff, the same, stuck at the logo, I believe I have to get the serial 
>> port working first.
>>
>> Thank you very much for all help so far, I greatly appreciated.
>>
>> -Hunter
>>
>> On Wednesday, March 5, 2014 9:35:06 PM UTC-6, Patrick Wood wrote:
>>>
>>> fatload nand 0 kernel_address kernel_file
>>>
>>> Note that my u-boot is based on a heavily-modified version of the one 
>>> used by android.
>>>
>>> On Wednesday, March 5, 2014 10:10:03 PM UTC-5, hunter hu wrote:

 Hi Pat,

 I was not be able to get serial port access yet, work in progress.

 Regarding the syntax, what are the correct ones?

 thanks,
 -Hunter

 On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick Wood wrote:
>
> That's not the right syntax for file access. Don't you have a serial 
> port you can get boot logs from?



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Re: [linux-sunxi] Re: How to decide NAND boot address?

[hunter hu]

Hi,

I finally got the serial port working on my board, just a side note, we 
need a pull up resistor at the Rx pin, and I am using UART1 with SD card 
approach, anyone struggles with serial port, here is the thread that helped 
me: https://www.olimex.com/forum/index.php?topic=1788.0

All goes well with the SD u-boot and I can stop at u-boot prompt and play 
with it, booting up as usual too by typing boot.

However when I set the NAND stuff up with lichee-dev u-boot built out of 
sun5i_a13, there is no serial output at all upon boot and stuck at logo, 
which indicates something is wrong with the u-boot image and it didn't run 
as expected.

I also tried just use the stock android u-boot, some posts say we can stop 
android u-boot when booting up, I didn't see that happen either.

Any ideas how to proceed from here would be greatly appreciated.

Thanks in advance,
-Hunter



On Wednesday, March 5, 2014 10:13:45 PM UTC-6, hunter hu wrote:
>
> Thanks Pat,
>
> I have used the correct syntax, but still, stuck at the SUNXI logo; at 
> this moment I have a few questions:
>
> 1> my cpu is A13, your u-boot is for A20, I would think that is not 
> working for me?
>
> 2> I have been using lichee-dev, sun5i_a13 board, trying to modify the 
> configurations as shown before;  when I was adding my board to the 
> u-boot-sunxi, I had to add a dram_myboard.c to configure the DRAM by 
> following the sunxi wiki instructions, I tried to do with and without the 
> DRAM stuff, the same, stuck at the logo, I believe I have to get the serial 
> port working first.
>
> Thank you very much for all help so far, I greatly appreciated.
>
> -Hunter
>
> On Wednesday, March 5, 2014 9:35:06 PM UTC-6, Patrick Wood wrote:
>>
>> fatload nand 0 kernel_address kernel_file
>>
>> Note that my u-boot is based on a heavily-modified version of the one 
>> used by android.
>>
>> On Wednesday, March 5, 2014 10:10:03 PM UTC-5, hunter hu wrote:
>>>
>>> Hi Pat,
>>>
>>> I was not be able to get serial port access yet, work in progress.
>>>
>>> Regarding the syntax, what are the correct ones?
>>>
>>> thanks,
>>> -Hunter
>>>
>>> On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick Wood wrote:

 That's not the right syntax for file access. Don't you have a serial 
 port you can get boot logs from?
>>>
>>>

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Re: [linux-sunxi] Re: How to decide NAND boot address?

[hunter hu]

Thanks Pat,

I have used the correct syntax, but still, stuck at the SUNXI logo; at this 
moment I have a few questions:

1> my cpu is A13, your u-boot is for A20, I would think that is not working 
for me?

2> I have been using lichee-dev, sun5i_a13 board, trying to modify the 
configurations as shown before;  when I was adding my board to the 
u-boot-sunxi, I had to add a dram_myboard.c to configure the DRAM by 
following the sunxi wiki instructions, I tried to do with and without the 
DRAM stuff, the same, stuck at the logo, I believe I have to get the serial 
port working first.

Thank you very much for all help so far, I greatly appreciated.

-Hunter

On Wednesday, March 5, 2014 9:35:06 PM UTC-6, Patrick Wood wrote:
>
> fatload nand 0 kernel_address kernel_file
>
> Note that my u-boot is based on a heavily-modified version of the one used 
> by android.
>
> On Wednesday, March 5, 2014 10:10:03 PM UTC-5, hunter hu wrote:
>>
>> Hi Pat,
>>
>> I was not be able to get serial port access yet, work in progress.
>>
>> Regarding the syntax, what are the correct ones?
>>
>> thanks,
>> -Hunter
>>
>> On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick Wood wrote:
>>>
>>> That's not the right syntax for file access. Don't you have a serial 
>>> port you can get boot logs from?
>>
>>

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Re: [linux-sunxi] Re: How to decide NAND boot address?

[Patrick Wood]

fatload nand 0 kernel_address kernel_file

Note that my u-boot is based on a heavily-modified version of the one used 
by android.

On Wednesday, March 5, 2014 10:10:03 PM UTC-5, hunter hu wrote:
>
> Hi Pat,
>
> I was not be able to get serial port access yet, work in progress.
>
> Regarding the syntax, what are the correct ones?
>
> thanks,
> -Hunter
>
> On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick Wood wrote:
>>
>> That's not the right syntax for file access. Don't you have a serial port 
>> you can get boot logs from?
>
>

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Re: [linux-sunxi] Re: How to decide NAND boot address?

[hunter hu]

Hi Pat,

I was not be able to get serial port access yet, work in progress.

Regarding the syntax, what are the correct ones?

thanks,
-Hunter

On Wednesday, March 5, 2014 8:51:22 PM UTC-6, Patrick Wood wrote:
>
> That's not the right syntax for file access. Don't you have a serial port 
> you can get boot logs from?

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Re: [linux-sunxi] Re: How to decide NAND boot address?

[Patrick Wood]

That's not the right syntax for file access. Don't you have a serial port you 
can get boot logs from?

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Re: [linux-sunxi] Re: How to decide NAND boot address?

[hunter hu]

Hi Henrik,

I tried to use fatload in the configurations like these:
182 #define CONFIG_EXTRA_ENV_SETTINGS \
183 "bootdelay=3\0" \
184 "bootcmd=run setargs load_uimage boot_uimage\0" \
185 "console=ttyS0,115200\0" \
186 "nand_root=/dev/nandb\0" \
187 "init=/init\0" \
188 "loglevel=8\0" \
189 "setargs=setenv bootargs console=${console} root=${nand_root}" \
190 "init=${init} loglevel=${loglevel}\0" \
191 "load_uimage=fatload nanda 4400 uImage\0" \
192 "boot_uimage=bootm 4400\0"
193 
194 #define CONFIG_BOOTDELAY1
195 #define CONFIG_BOOTCOMMAND  "fatload nanda 4400 uImage;bootm 
4400"
196 #define CONFIG_SYS_BOOT_GET_CMDLINE
197 #define CONFIG_AUTO_COMPLETE


But I am still stuck at the SUNXI logo(that part I got it :-) ), anything 
wrong with the above configurations?

Thanks,
-Hunter


On Tuesday, March 4, 2014 11:30:43 AM UTC-6, Henrik Nordström wrote:
>
> The lichee u-boot also support fat access, just use fatload instead of 
> nand command to load files. 
>
> mån 2014-03-03 klockan 16:41 -0800 skrev Patrick Wood: 
> > This version of uboot loads the entire partition into RAM, not the 
> > uImage file.  You need a modified uboot that can be set up more like 
> > the one that's used on SD 
> > cards: http://www.cubieforums.com/index.php?topic=511.0 
> > 
> > 
> > Pat 
> > 
> > On Monday, March 3, 2014 4:00:55 PM UTC-5, hunter hu wrote: 
> > Thanks Patrick, 
> > 
> > 
> > Does this mean I don't need to change the default 5000 at 
> > all? 
> > 
> > 
> > My intention is to load Linux instead of Android from NAND and 
> > following this sunxi 
> > wiki: http://linux-sunxi.org/Installing_to_NAND. 
> > 
> > 
> > What changes need to be made in the uboot env besides 
> > the /dev/nandd -> /dev/nandb? 
> > 
> > 
> > -Hunter 
> > 
> > On Monday, March 3, 2014 2:45:21 PM UTC-6, Patrick Wood wrote: 
> > That's not the nand read address; that's the RAM 
> > address where the nand read command stores data read 
> > from nand.  The last argument (boot, recovery) is the 
> > nand partition name where it's reading data. 
> > 
> > 
> > This is how an android kernel+initrd is loaded. 
> > 
> > On Monday, March 3, 2014 2:42:17 PM UTC-5, hunter hu 
> > wrote: 
> > Hi All, 
> > 
> > 
> > I am trying to boot from NAND, and using 
> > Allwinner lichee-dev branch, in the 
> > sun5i_a13.h header, there is a section of hard 
> > coded environment setup like this: 
> > 
> > 
> > 81 #define CONFIG_EXTRA_ENV_SETTINGS \ 
> > 182 "bootdelay=3\0" \ 
> > 183 "bootcmd=run setargs boot_normal\0" \ 
> > 184 "console=ttyS0,115200\0" \ 
> > 185 "nand_root=/dev/nandd\0" \ 
> > 186 "mmc_root=/dev/mmcblk0p4\0" \ 
> > 187 "init=/init\0" \ 
> > 188 "loglevel=8\0" \ 
> > 189 "setargs=setenv bootargs console= 
> > ${console} root=${nand_root}" \ 
> > 190 "init=${init} loglevel=${loglevel}\0" 
> > \ 
> > 191 "boot_normal=nand read 5000 boot; 
> > boota 5000\0" \ 
> > 192 "boot_recovery=nand read 5000 
> > recovery; boota 5000\0" \ 
> > 193 "boot_fastboot=fastboot\0" 
> > 
> > My question is: how do I find the nand read 
> > address of my own instead of default 5000? 
> > 
> > 
> > My nand-part on the tablet looks like: 
> > 
> > 
> >   9 mbr: version 0x0100, magic softw311 
> >  10 2 partitions 
> >  11 partition  1: class = DISK, name = 
> > boot, partition start =32768, partition 
> > size =52768 user_type=0 
> >  12 partition  2: class = DISK, name = 
> > root, partition start =85536, partition 
> > size = 15479264 user_type=0 
> >   
> > Is that 

Re: [linux-sunxi] Re: How to decide NAND boot address?

[Henrik Nordström]

The lichee u-boot also support fat access, just use fatload instead of
nand command to load files.

mån 2014-03-03 klockan 16:41 -0800 skrev Patrick Wood:
> This version of uboot loads the entire partition into RAM, not the
> uImage file.  You need a modified uboot that can be set up more like
> the one that's used on SD
> cards: http://www.cubieforums.com/index.php?topic=511.0
> 
> 
> Pat
> 
> On Monday, March 3, 2014 4:00:55 PM UTC-5, hunter hu wrote:
> Thanks Patrick,
> 
> 
> Does this mean I don't need to change the default 5000 at
> all?
> 
> 
> My intention is to load Linux instead of Android from NAND and
> following this sunxi
> wiki: http://linux-sunxi.org/Installing_to_NAND.
> 
> 
> What changes need to be made in the uboot env besides
> the /dev/nandd -> /dev/nandb?
> 
> 
> -Hunter
> 
> On Monday, March 3, 2014 2:45:21 PM UTC-6, Patrick Wood wrote:
> That's not the nand read address; that's the RAM
> address where the nand read command stores data read
> from nand.  The last argument (boot, recovery) is the
> nand partition name where it's reading data.
> 
> 
> This is how an android kernel+initrd is loaded.
> 
> On Monday, March 3, 2014 2:42:17 PM UTC-5, hunter hu
> wrote:
> Hi All,
> 
> 
> I am trying to boot from NAND, and using
> Allwinner lichee-dev branch, in the
> sun5i_a13.h header, there is a section of hard
> coded environment setup like this:
> 
> 
> 81 #define CONFIG_EXTRA_ENV_SETTINGS \
> 182 "bootdelay=3\0" \
> 183 "bootcmd=run setargs boot_normal\0" \
> 184 "console=ttyS0,115200\0" \
> 185 "nand_root=/dev/nandd\0" \
> 186 "mmc_root=/dev/mmcblk0p4\0" \
> 187 "init=/init\0" \
> 188 "loglevel=8\0" \
> 189 "setargs=setenv bootargs console=
> ${console} root=${nand_root}" \
> 190 "init=${init} loglevel=${loglevel}\0"
> \
> 191 "boot_normal=nand read 5000 boot;
> boota 5000\0" \
> 192 "boot_recovery=nand read 5000
> recovery; boota 5000\0" \
> 193 "boot_fastboot=fastboot\0"
> 
> My question is: how do I find the nand read
> address of my own instead of default 5000?
> 
> 
> My nand-part on the tablet looks like:
> 
> 
>   9 mbr: version 0x0100, magic softw311
>  10 2 partitions
>  11 partition  1: class = DISK, name =
> boot, partition start =32768, partition
> size =52768 user_type=0
>  12 partition  2: class = DISK, name =
> root, partition start =85536, partition
> size = 15479264 user_type=0
>  
> Is that the start of nandb which is 85536 x
> 512 = 43794432 ?
> 
> 
> I also need to change /dev/nandd to /dev/nandb
> because I boot from the second
> partition /dev/nandb, correct?
> 
> 
> Any hints are greatly appreciated,
> 
> 
> Cheers,
> -Hunter
> 
> 
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[linux-sunxi] Re: How to decide NAND boot address?

[Patrick Wood]

This version of uboot loads the entire partition into RAM, not the uImage 
file.  You need a modified uboot that can be set up more like the one 
that's used on SD cards: http://www.cubieforums.com/index.php?topic=511.0

Pat

On Monday, March 3, 2014 4:00:55 PM UTC-5, hunter hu wrote:
>
> Thanks Patrick,
>
> Does this mean I don't need to change the default 5000 at all?
>
> My intention is to load Linux instead of Android from NAND and following 
> this sunxi wiki: http://linux-sunxi.org/Installing_to_NAND.
>
> What changes need to be made in the uboot env besides the /dev/nandd -> 
> /dev/nandb?
>
> -Hunter
>
> On Monday, March 3, 2014 2:45:21 PM UTC-6, Patrick Wood wrote:
>>
>> That's not the nand read address; that's the RAM address where the nand 
>> read command stores data read from nand.  The last argument (boot, 
>> recovery) is the nand partition name where it's reading data.
>>
>> This is how an android kernel+initrd is loaded.
>>
>> On Monday, March 3, 2014 2:42:17 PM UTC-5, hunter hu wrote:
>>>
>>> Hi All,
>>>
>>> I am trying to boot from NAND, and using Allwinner lichee-dev branch, in 
>>> the sun5i_a13.h header, there is a section of hard coded environment setup 
>>> like this:
>>>
>>> 81 #define CONFIG_EXTRA_ENV_SETTINGS \
>>> 182 "bootdelay=3\0" \
>>> 183 "bootcmd=run setargs boot_normal\0" \
>>> 184 "console=ttyS0,115200\0" \
>>> 185 "nand_root=/dev/nandd\0" \
>>> 186 "mmc_root=/dev/mmcblk0p4\0" \
>>> 187 "init=/init\0" \
>>> 188 "loglevel=8\0" \
>>> 189 "setargs=setenv bootargs console=${console} root=${nand_root}" \
>>> 190 "init=${init} loglevel=${loglevel}\0" \
>>> 191 "boot_normal=nand read 5000 boot; boota 5000\0" \
>>> 192 "boot_recovery=nand read 5000 recovery; boota 5000\0" \
>>> 193 "boot_fastboot=fastboot\0"
>>>
>>> My question is: how do I find the nand read address of my own instead of 
>>> default 5000?
>>>
>>> My nand-part on the tablet looks like:
>>>
>>>   9 mbr: version 0x0100, magic softw311
>>>  10 2 partitions
>>>  11 partition  1: class = DISK, name = boot, partition 
>>> start =32768, partition size =52768 user_type=0
>>>  12 partition  2: class = DISK, name = root, partition 
>>> start =85536, partition size = 15479264 user_type=0
>>>  
>>> Is that the start of nandb which is 85536 x 512 = 43794432 ?
>>>
>>> I also need to change /dev/nandd to /dev/nandb because I boot from the 
>>> second partition /dev/nandb, correct?
>>>
>>> Any hints are greatly appreciated,
>>>
>>> Cheers,
>>> -Hunter
>>>
>>>

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[linux-sunxi] Re: How to decide NAND boot address?

[hunter hu]

Thanks Patrick,

Does this mean I don't need to change the default 5000 at all?

My intention is to load Linux instead of Android from NAND and following 
this sunxi wiki: http://linux-sunxi.org/Installing_to_NAND.

What changes need to be made in the uboot env besides the /dev/nandd -> 
/dev/nandb?

-Hunter

On Monday, March 3, 2014 2:45:21 PM UTC-6, Patrick Wood wrote:
>
> That's not the nand read address; that's the RAM address where the nand 
> read command stores data read from nand.  The last argument (boot, 
> recovery) is the nand partition name where it's reading data.
>
> This is how an android kernel+initrd is loaded.
>
> On Monday, March 3, 2014 2:42:17 PM UTC-5, hunter hu wrote:
>>
>> Hi All,
>>
>> I am trying to boot from NAND, and using Allwinner lichee-dev branch, in 
>> the sun5i_a13.h header, there is a section of hard coded environment setup 
>> like this:
>>
>> 81 #define CONFIG_EXTRA_ENV_SETTINGS \
>> 182 "bootdelay=3\0" \
>> 183 "bootcmd=run setargs boot_normal\0" \
>> 184 "console=ttyS0,115200\0" \
>> 185 "nand_root=/dev/nandd\0" \
>> 186 "mmc_root=/dev/mmcblk0p4\0" \
>> 187 "init=/init\0" \
>> 188 "loglevel=8\0" \
>> 189 "setargs=setenv bootargs console=${console} root=${nand_root}" \
>> 190 "init=${init} loglevel=${loglevel}\0" \
>> 191 "boot_normal=nand read 5000 boot; boota 5000\0" \
>> 192 "boot_recovery=nand read 5000 recovery; boota 5000\0" \
>> 193 "boot_fastboot=fastboot\0"
>>
>> My question is: how do I find the nand read address of my own instead of 
>> default 5000?
>>
>> My nand-part on the tablet looks like:
>>
>>   9 mbr: version 0x0100, magic softw311
>>  10 2 partitions
>>  11 partition  1: class = DISK, name = boot, partition 
>> start =32768, partition size =52768 user_type=0
>>  12 partition  2: class = DISK, name = root, partition 
>> start =85536, partition size = 15479264 user_type=0
>>  
>> Is that the start of nandb which is 85536 x 512 = 43794432 ?
>>
>> I also need to change /dev/nandd to /dev/nandb because I boot from the 
>> second partition /dev/nandb, correct?
>>
>> Any hints are greatly appreciated,
>>
>> Cheers,
>> -Hunter
>>
>>

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[linux-sunxi] Re: How to decide NAND boot address?

[Patrick Wood]

That's not the nand read address; that's the RAM address where the nand 
read command stores data read from nand.  The last argument (boot, 
recovery) is the nand partition name where it's reading data.

This is how an android kernel+initrd is loaded.

On Monday, March 3, 2014 2:42:17 PM UTC-5, hunter hu wrote:
>
> Hi All,
>
> I am trying to boot from NAND, and using Allwinner lichee-dev branch, in 
> the sun5i_a13.h header, there is a section of hard coded environment setup 
> like this:
>
> 81 #define CONFIG_EXTRA_ENV_SETTINGS \
> 182 "bootdelay=3\0" \
> 183 "bootcmd=run setargs boot_normal\0" \
> 184 "console=ttyS0,115200\0" \
> 185 "nand_root=/dev/nandd\0" \
> 186 "mmc_root=/dev/mmcblk0p4\0" \
> 187 "init=/init\0" \
> 188 "loglevel=8\0" \
> 189 "setargs=setenv bootargs console=${console} root=${nand_root}" \
> 190 "init=${init} loglevel=${loglevel}\0" \
> 191 "boot_normal=nand read 5000 boot; boota 5000\0" \
> 192 "boot_recovery=nand read 5000 recovery; boota 5000\0" \
> 193 "boot_fastboot=fastboot\0"
>
> My question is: how do I find the nand read address of my own instead of 
> default 5000?
>
> My nand-part on the tablet looks like:
>
>   9 mbr: version 0x0100, magic softw311
>  10 2 partitions
>  11 partition  1: class = DISK, name = boot, partition 
> start =32768, partition size =52768 user_type=0
>  12 partition  2: class = DISK, name = root, partition 
> start =85536, partition size = 15479264 user_type=0
>  
> Is that the start of nandb which is 85536 x 512 = 43794432 ?
>
> I also need to change /dev/nandd to /dev/nandb because I boot from the 
> second partition /dev/nandb, correct?
>
> Any hints are greatly appreciated,
>
> Cheers,
> -Hunter
>
>

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