Am 18.11.2019 um 19:08 schrieb Wolfgang Grandegger:
Hello,
I'm trying to understand what is necessary to get mainline U-Boot
booting from the eMMC of an Arria10 board, which is significantly
different to the Cyclone 5.
Unfortunately, my playground here is limited to Cyclone 5, but from the
U-Boot side and from what I know, booting an Arria 10 should be very
similar to Cyclone5 (given that Stratix 10 and Agilex have a very much
different boot flow).
Do you have vendor U-Boot running? If not, I suggest to first get that
running. The step to mainline U-Boot should then hopefully not be too hard.
I'm playing with U-Boot v2019.10! I find some related documentation at
[1]. Section "Arria 10 SoC - Boot from SD Card " seems to apply to the
mainline U-Boot as well, at a first glance. Is there some similar doc
for mainline U-Boot? What are the differences in mainline? Is it working
or is something missing?
So I need at least three partitions on the eMMC:
1. VFAT partition with u-boot.img and fit_spl_fpga.itb
2. A2 partition with 4x u-boot-spl.sfp (or u-boot-with-spl.sfp)
3. Linux partition
Where do I specify the physical number of the partition 1.?
In the config (or via menuconfig), set
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION to y and
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION contains the partition number
Is it still possible to load the secondary bootloader (u-boot.img) from
offset 0x800 of the A2 partition? It seems that "SPL_FS_FAT" breaks it.
Yes, and no. Enable the above and enable
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR as well then
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR controls the offset in this
partition. However, this uses
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION, which is not necessarily the
same as the boot-ROM-detected A2 partition.
Hope that helps.
Regards,
Simon
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