[U-Boot] boot linux kernel from NAND
Hi
We have a custom board where we are using u-boot to boot linux kernel from NOR flash. This is working alright.
However, we are planning to replace the NOR flash with NAND flash. There will be no NOR flash on the board. So I need to boot linux kernel from NAND.
My question is what works do I need to do so that u-boot can boot linux from NAND? Do I need to implement something like a NAND driver for u-boot, or do I just need to modify some u-boot configurations?
By the way, I am talking about booting linux kernel, not u-boot itself. u-boot itself will be loaded from NAND and kicked by using a feature of the board which I am not clear at the moment.
Many thanks in advance for any info on this.
Best regards Round Robin
On Wed, Jan 21, 2009 at 4:02 AM, roundrobin iram.shahzad@jp.fujitsu.comwrote:
Hi
We have a custom board where we are using u-boot to boot linux kernel from NOR flash. This is working alright.
However, we are planning to replace the NOR flash with NAND flash. There will be no NOR flash on the board. So I need to boot linux kernel from NAND.
I use the command:
nboot.i 20000000 primary
primary is in my mtdparts environment variable:
mtdparts=nand:7m@0m(primary),7m@7m(secondary,2m@14m(config)
mtdids is nand0=nand
partition is nand0,0
My question is what works do I need to do so that u-boot can boot linux from NAND? Do I need to implement something like a NAND driver for u-boot, or do I just need to modify some u-boot configurations?
You're going to have to configure your nand flash in your board config file. I believe there are sufficient examples for you to read.
By the way, I am talking about booting linux kernel, not u-boot itself. u-boot itself will be loaded from NAND and kicked by using a feature of the board which I am not clear at the moment.
Many thanks in advance for any info on this.
Best regards Round Robin
-- View this message in context: http://www.nabble.com/boot-linux-kernel-from-NAND-tp21579236p21579236.html Sent from the Uboot - Users mailing list archive at Nabble.com.
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Thanks a lot for the reply.
What I understand from the reply is I need to change my bootcmd environment variable. Currently for loading kernel from NOR, it uses bootm command; now I have to change it to nboot command. Also I understand that I do not need to write a NAND driver for this purpose.
Please confirm if my understanding is correct.
By the way, what is the purpose of the code in nand_spl directory?
Matt Gessner-2 wrote:
Hi
We have a custom board where we are using u-boot to boot linux kernel from NOR flash. This is working alright.
However, we are planning to replace the NOR flash with NAND flash. There will be no NOR flash on the board. So I need to boot linux kernel from NAND.
I use the command:
nboot.i 20000000 primary
primary is in my mtdparts environment variable:
mtdparts=nand:7m@0m(primary),7m@7m(secondary,2m@14m(config)
mtdids is nand0=nand
partition is nand0,0
My question is what works do I need to do so that u-boot can boot linux from NAND? Do I need to implement something like a NAND driver for u-boot, or do I just need to modify some u-boot configurations?
You're going to have to configure your nand flash in your board config file. I believe there are sufficient examples for you to read.
By the way, I am talking about booting linux kernel, not u-boot itself. u-boot itself will be loaded from NAND and kicked by using a feature of the board which I am not clear at the moment.
Many thanks in advance for any info on this.
Best regards Round Robin
-- View this message in context: http://www.nabble.com/boot-linux-kernel-from-NAND-tp21579236p21579236.html Sent from the Uboot - Users mailing list archive at Nabble.com.
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
-----Original Message----- From: u-boot-bounces@lists.denx.de [mailto:u-boot-bounces@lists.denx.de] On Behalf Of roundrobin Sent: Thursday, January 22, 2009 7:54 AM To: u-boot@lists.denx.de Subject: Re: [U-Boot] boot linux kernel from NAND
Thanks a lot for the reply.
What I understand from the reply is I need to change my bootcmd environment variable. Currently for loading kernel from NOR, it uses bootm command; now I have to change it to nboot command. Also I understand that I do not need to write a NAND driver for this purpose.
Please confirm if my understanding is correct.
By the way, what is the purpose of the code in nand_spl directory?
This is the code required when your u-boot is on NAND and you would like to boot from NAND. This is the first 4K code which would be read by the SOC after reset from the NAND device into an internal buffer.
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-- View this message in context: http://www.nabble.com/boot-linux-kernel-from-NAND-tp21579236p2 1593758.html Sent from the Uboot - Users mailing list archive at Nabble.com.
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
participants (3)
-
Aggrwal Poonam -
Matt Gessner -
roundrobin