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.
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