5 Jan
2015
5 Jan
'15
8:55 p.m.
On 12/28/2014 03:09 AM, Ian Campbell wrote:
On Mon, 2014-12-22 at 13:46 -0700, Stephen Warren wrote:
[...]
+The U-Boot "syslinux" and "pxe boot" commands require a number of environment +variables be set. Default values for these variables are often hard-coded into +CONFIG_EXTRA_ENV_SETTINGS in the board's U-Boot configuration file, so that +the user doesn't have to configure them.
+fdt_addr:
- Optional. If specified a dtb to boot the system must be available at the
- given address.
+fdt_addr_r:
- Mandatory.
Isn't this one only mandatory if ${fdt_addr} is not given?
Yes. I guess it's mandatory for at least one of fdt_addr or fdt_addr_r to be set, according to common/cmd_pxe.c:
* fdt usage is optional: * It handles the following scenarios. All scenarios are exclusive * * Scenario 1: If fdt_addr_r specified and "fdt" label is defined in * pxe file, retrieve fdt blob from server. Pass fdt_addr_r to bootm, * and adjust argc appropriately. * * Scenario 2: If there is an fdt_addr specified, pass it along to * bootm, and adjust argc appropriately. * * Scenario 3: fdt blob is not available.
So, I'll need to reword that a little to make that clear.