[U-Boot] Build u-Boot for NAND boot on i.MX53x platform
Can someone clue me in how one goes about a NAND bootable u-Boot?
-bud
On Wednesday 08 February 2012 17:16:10 Bud Miljkovic wrote:
Can someone clue me in how one goes about a NAND bootable u-Boot?
Bud
You can't actually run uboot from NAND per se. The rom boot loader reads the image into ram where it runs.
Based on my experience with omap - which uses a very similar sequence - you need to configure the uboot to run from the desired location in RAM. The resulting uboot.bin must then be mashed in whatever way is appropriate for loading with the rom boot loader and programmed to flash.
-- CHarles
On 02/09/2012 02:04 PM, Charles Manning wrote:
On Wednesday 08 February 2012 17:16:10 Bud Miljkovic wrote:
Can someone clue me in how one goes about a NAND bootable u-Boot?
Bud
You can't actually run uboot from NAND per se. The rom boot loader reads the image into ram where it runs.
Based on my experience with omap - which uses a very similar sequence - you need to configure the uboot to run from the desired location in RAM. The resulting uboot.bin must then be mashed in whatever way is appropriate for loading with the rom boot loader and programmed to flash.
On some hardware, the boot rom/logic will only load a small piece from RAM (e.g. 4K). U-Boot can be built with a prepended miniloader (SPL) to fetch the main U-Boot image. The details (and whether this is supported at all) depend on what board you're talking about. There is SPL support for some i.MX chips -- not sure about i.MX53x.
-Scott
On 08/02/2012 05:16, Bud Miljkovic wrote:
Can someone clue me in how one goes about a NAND bootable u-Boot?
The mkimage tool supports the generation of the image that can be loaded into a NAND flash. However, the main problem is that at the moment there is no NAND driver for MX53. The mxc_nand.c driver does not support MX5 SOCs.
Best regards, Stefano Babic
On 2/10/12, Stefano Babic sbabic@denx.de wrote:
The mkimage tool supports the generation of the image that can be loaded into a NAND flash. However, the main problem is that at the moment there is no NAND driver for MX53. The mxc_nand.c driver does not support MX5 SOCs.
Yes, but the internal boot mode can be used though.
Regards,
Fabio Estevam
On 10/02/2012 16:05, Fabio Estevam wrote:
On 2/10/12, Stefano Babic sbabic@denx.de wrote:
The mkimage tool supports the generation of the image that can be loaded into a NAND flash. However, the main problem is that at the moment there is no NAND driver for MX53. The mxc_nand.c driver does not support MX5 SOCs.
Yes, but the internal boot mode can be used though.
Yes, this is right - this is what I meant with "mkimage support".
However, u-boot does not help to install itself in NAND, and you must use other tools to physically store the image on the NAND. And the environment must be still saved on another storage (MMC for example), as well as other images that must be accessed by the bootloader. If I had to write a to-do list to make a MX53 based hardware really working with NAND, adding a NAND driver for MX5 to u-boot goes to first place.
Best regards, Stefano Babic
participants (5)
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Bud Miljkovic -
Charles Manning -
Fabio Estevam -
Scott Wood -
Stefano Babic