On 12/08/2015 10:04 AM, Stephen Warren wrote:
From: Stephen Warren <swarren@xxxxxxxxxx> This is for the Jetson TX1 developer kit. The SDRAM timings were taken from the L4T r23 release.
I have applied this, although I have found a few caveats with the content when used with nvtboot. In particular, nvtboot appears to expect:
a) num_sdram_sets to be equal to 0. This causes the boot ROM not to initialize SDRAM, which then triggers nvtboot to do so. Either nvtboot initializes SDRAM differently than the boot ROM does even when using the same SDRAM parameters from the BCT, or there are other side-effects of running the SDRAM initialization code in nvtboot, such that skipping this operation causes nvtboot to fail to operate correctly. My suspicion so far is the latter, but more investigation is required.
b) nvtboot expects the customer_data field in the BCT to contain some additional data structures, e.g. board IDs.
Fixing these issues will likely only require additions to the BCT definition in this patch, rather than requiring anything in the patch to be modified/fixed. Hence it seems reasonable to apply this. cbootimage changes would also be required in order to set up the extra fields.
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