[U-Boot-Users] Re: My 3 patches
Hi, Wolfgang.
How about my 3 patches? I'm looking forward to your reply. Thanks.
By the way, SBC-2410X board is made by friendly-arm, a chinese corporation. Here is a manual webpage for SBC-2410X (in Chinese): http://www.arm9.net/matrix-v.asp
Recently, I am working on making U-Boot boot from nand on SBC-2410X board. Do you think it is meaningful? In my opinion, nand flash has at least advantages below: 1. nand flash is cheaper than nor flash. 2. nand flash is bigger than nor flash in size. We can boot from nand flash, meanwhile it serves as data rom too. Nor flash seems redundancy on the board.
Of course, nor flash is popular yet. No wonder that U-Boot considers nor flash as boot rom by default. But, why SAMSUNG's S3C2410X owns builtin "boot from nand" function? It hints.
"Recently, a NOR flash memory gets high in price while an SDRAM and a NAND flash memory get moderate, motivating some users to execute the boot code on a NAND flash and execute the main code on an SDRAM.
S3C2410X boot code can be executed on an external NAND flash memory. In order to support NAND flash boot loader, the S3C2410X is equipped with an internal SRAM buffer called ‘Steppingstone’. When booting, the first 4 KBytes of the NAND flash memory will be loaded into Steppingstone and the boot code loaded into Steppingstone will be executed."
--quoted from S3C2410X's datasheet.
Correspondingly, YAFFS, a NAND-flash friendly filing system, will be a good choice to be added into U-Boot. More detail: http://www.aleph1.co.uk/armlinux/projects/
Best regards,
luo.jinhua
---------- JinHua Luo, GuangDong Linux Center, luo.jinhua@gd-linux.com
In message 20050906012549.M16097@gd-linux.com you wrote:
How about my 3 patches? I'm looking forward to your reply. Thanks.
They are sitting in my queue waiting to be reviewed and eventually applied or rejected. Please be patient.
Here is a manual webpage for SBC-2410X (in Chinese): http://www.arm9.net/matrix-v.asp
Is there an English manual, too?
Recently, I am working on making U-Boot boot from nand on SBC-2410X board. Do you think it is meaningful? In my opinion, nand flash has at least advantages
This can be an issue if you have really high volumes of your boards and try to minimize the production cost at the expense of reliability.
¡®Steppingstone¡¯. When booting, the first 4 KBytes of the NAND flash memory will be loaded into Steppingstone and the boot code loaded into Steppingstone will be executed."
Here you see the problem: you will need a separate first stage loader to do all the low level initializations and then load U-Boot to RAM like it has been implemented on some other systems before. The probelm is that all comfort you have witrh U-Boot during board bringup and U-Bootporting gets lost this way.
Correspondingly, YAFFS, a NAND-flash friendly filing system, will be a good choice to be added into U-Boot.
Feel free to submit patches.
Best regards,
Wolfgang Denk
participants (2)
-
luo.jinhua -
Wolfgang Denk