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| likewise | good morning | 11:05 |
|---|---|---|
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| likewise | otavio: Hi, is there an existing i.MX platform that boots directly into Linux using a dcd.cfg in meta-freescale*? | 11:15 |
| otavio | good morning likewise | 11:16 |
| otavio | it does not. I made it for a specific customer | 11:17 |
| otavio | generally speaking, you will prefer U-Boot Falcon mode instead | 11:17 |
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| likewise | otavio: thanks. Unless boot time is really most important. | 11:21 |
| likewise | I'm investigating how to use eMMC dual hardware-boot-partitions, e.MMC fast boot, eMMC ack'd fast boot, eMMC 8-bit etc under i.MX | 11:22 |
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| likewise | I was first thinking: nice to have A/B kernel+initramfs in both boot partitions, but the iMX does not have a fall-back mechanism AFAIK | 11:23 |
| likewise | so yes I think SPL mode is more flexible, as there I can take into account bootcnt etc. | 11:24 |
| otavio | likewise: in fact, U-Boot will likely be faster as it enables cache | 11:25 |
| otavio | likewise: the use-case we added the dcd boot support for a in-field recovery tool | 11:26 |
| likewise | otavio: with U-Boot you mean; the full monty, not just SPL? | 11:26 |
| otavio | SPL | 11:27 |
| likewise | ok SPL | 11:27 |
| otavio | in fact both. But SPL is faster of course | 11:27 |
| likewise | otavio: did you ever play with the eMMC fuses for eMMC boot modes? | 11:27 |
| likewise | i.MX fuses that are eMMC related I mean | 11:28 |
| otavio | yes | 11:28 |
| otavio | some time ago | 11:28 |
| likewise | I guess it doesn't help much only loading the SPL. | 11:28 |
| likewise | from there on, eMMC settings are already under software control | 11:29 |
| otavio | what do you mean? | 11:30 |
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| likewise | otavio: initial boot rom reads from eMMC at slowest speed, 1bit, this can be enhanced with fuse settings. | 13:19 |
| likewise | otavio: but as the SPL is so small, increasing the boot load speed using fuses is of little use. | 13:20 |
| likewise | otavio: the SPL will configure the controller to load U-Boot or Linux kernel at maximum speed anyways. | 13:20 |
| likewise | otavio: setting the fuses for optimal eMMC read speed would certainly be needed when loading the max BootROM capable image: 32 MB | 13:21 |
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