On 24.01.19 13:21, Andre Przywara wrote:
On Thu, 24 Jan 2019 13:07:54 +0100 Alexander Graf agraf@suse.de wrote:
On 24.01.19 12:31, Andre Przywara wrote:
Ok, that did not help. I guess the next best useful thing to do now would be to measure what the MISO line shows in each situation. Unfortunately I don't have my oscilloscope handy :).
Can't you configure PC1 as a gpio, and read that? Not sure the "gpio" command works with PC1 being a "function pin", but you could always hack it to GPIO-in by clearing bits[7:4] in 0x01C20848, with md.l/mw.l.
That showed a 0. But it doesn't really tell any story over time :).
However, I quickly added a bit of debug output to the SD command emission code. And the spi flash already stops working while the eMMC is booting up. So this is nothing we configure - the eMMC simply pulls that line down automatically as soon as it's booted up.
If I configure it to not ever emit CMD1, the SF keeps working, but the eMMC does not come up unfortunately. I guess it's not compatible to the pure SD command set.
Alex
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SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 0 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 8 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 55 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 0 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 1 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 1 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 0 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 1 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 1 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 1 ... allowed SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB MMC CMD 1 ... allowed SF: unrecognized JEDEC id bytes: 00, 00, 00 Failed to initialize SPI flash at 0:0 (error -2) MMC CMD 1 ... allowed SF: unrecognized JEDEC id bytes: 00, 00, 00 Failed to initialize SPI flash at 0:0 (error -2) MMC CMD 2 ... allowed SF: unrecognized JEDEC id bytes: 00, 00, 00 Failed to initialize SPI flash at 0:0 (error -2) MMC CMD 3 ... allowed [...]
Alex