[ast2500] aspeed-smc fail with MX25L25635F

[Shakeeb B K]

Hi All,

We are working with Macronix MX25L25635F, and are not able to get spi nor
access working from linux(develop-5.10).
u-boot flash drivers work fine - able to verify the flash contents.
But linux aspeed-smc seems to be having issues, with read calibration
failing all the time
[    1.746960] aspeed-smc 1e620000.spi: Using 50 MHz SPI frequency
[    1.753028] aspeed-smc 1e620000.spi: control register: 000b0641
[    1.758982] aspeed-smc 1e620000.spi: control register changed to:
00000600
[    1.765947] aspeed-smc 1e620000.spi: default control register: 00000600
[    1.772810] aspeed-smc 1e620000.spi: mx25l25635e (32768 Kbytes)
[    1.778773] aspeed-smc 1e620000.spi: CE0 window [ 0x20000000 -
0x22000000 ] 32MB
[    1.786286] aspeed-smc 1e620000.spi: CE1 window [ 0x22000000 -
0x2a000000 ] 128MB
[    1.793873] aspeed-smc 1e620000.spi: write control register: 00120602
[    1.800341] aspeed-smc 1e620000.spi: read control register: 203c0641
[    1.806791] aspeed-smc 1e620000.spi: AHB frequency: 198 MHz
[    1.823440] aspeed-smc 1e620000.spi: Trying HCLK/5 [203c0d41] ...
[    1.831524] aspeed-smc 1e620000.spi:   * [00080000] 0 HCLK delay, 4ns DI
delay : FAIL
[    1.841333] aspeed-smc 1e620000.spi:   * [00000000] 0 HCLK delay, 0ns DI
delay : FAIL
[    1.851152] aspeed-smc 1e620000.spi:   * [00090000] 1 HCLK delay, 4ns DI
delay : FAIL
[    1.860969] aspeed-smc 1e620000.spi:   * [00010000] 1 HCLK delay, 0ns DI
delay : FAIL
[    1.870746] aspeed-smc 1e620000.spi:   * [000a0000] 2 HCLK delay, 4ns DI
delay : FAIL
[    1.880579] aspeed-smc 1e620000.spi:   * [00020000] 2 HCLK delay, 0ns DI
delay : FAIL
[    1.890435] aspeed-smc 1e620000.spi:   * [000b0000] 3 HCLK delay, 4ns DI
delay : FAIL
[    1.900301] aspeed-smc 1e620000.spi:   * [00030000] 3 HCLK delay, 0ns DI
delay : FAIL
[    1.910182] aspeed-smc 1e620000.spi:   * [000c0000] 4 HCLK delay, 4ns DI
delay : FAIL
[    1.920060] aspeed-smc 1e620000.spi:   * [00040000] 4 HCLK delay, 0ns DI
delay : FAIL
[    1.929964] aspeed-smc 1e620000.spi:   * [000d0000] 5 HCLK delay, 4ns DI
delay : FAIL
[    1.939869] aspeed-smc 1e620000.spi:   * [00050000] 5 HCLK delay, 0ns DI
delay : FAIL
[    1.947796] aspeed-smc 1e620000.spi: Trying HCLK/4 [203c0641] ...
[    1.955529] aspeed-smc 1e620000.spi:   * [00008000] 0 HCLK delay, 4ns DI
delay : FAIL
[    1.964998] aspeed-smc 1e620000.spi:   * [00000000] 0 HCLK delay, 0ns DI
delay : FAIL
[    1.974483] aspeed-smc 1e620000.spi:   * [00009000] 1 HCLK delay, 4ns DI
delay : FAIL
[    1.983967] aspeed-smc 1e620000.spi:   * [00001000] 1 HCLK delay, 0ns DI
delay : FAIL
[    1.993475] aspeed-smc 1e620000.spi:   * [0000a000] 2 HCLK delay, 4ns DI
delay : FAIL
[    2.002986] aspeed-smc 1e620000.spi:   * [00002000] 2 HCLK delay, 0ns DI
delay : FAIL
[    2.012508] aspeed-smc 1e620000.spi:   * [0000b000] 3 HCLK delay, 4ns DI
delay : FAIL
[    2.022035] aspeed-smc 1e620000.spi:   * [00003000] 3 HCLK delay, 0ns DI
delay : FAIL
[    2.031581] aspeed-smc 1e620000.spi:   * [0000c000] 4 HCLK delay, 4ns DI
delay : FAIL
[    2.041131] aspeed-smc 1e620000.spi:   * [00004000] 4 HCLK delay, 0ns DI
delay : FAIL
[    2.050639] aspeed-smc 1e620000.spi:   * [0000d000] 5 HCLK delay, 4ns DI
delay : FAIL
[    2.060203] aspeed-smc 1e620000.spi:   * [00005000] 5 HCLK delay, 0ns DI
delay : FAIL
[    2.068116] aspeed-smc 1e620000.spi: No good frequency, using dumb slow
[    2.077460] 5 fixed-partitions partitions found on MTD device bmc
[    2.083721] Creating 5 MTD partitions on "bmc":
[    2.088289] 0x000000000000-0x000000060000 : "u-boot"
[    2.096067] 0x000000060000-0x000000080000 : "u-boot-env"
[    2.104054] 0x000000080000-0x0000004c0000 : "kernel"
[    2.111699] 0x0000004c0000-0x000001c00000 : "rofs"
[    2.119091] 0x000001c00000-0x000002000000 : "rwfs"
...
rofs = mtd4 squashfs rwfs = mtd5 jffs2
mount: mounting /dev/mtdblock4 on run/initramfs/ro failed: Invalid argument
[    3.654132] jffs2: Node totlen on flash (0xffffffff) != totlen from node
ref (0x0000000c)
[    3.685843] jffs2: Node totlen on flash (0xffffffff) != totlen from node
ref (0x00000044)
[    3.694229] overlayfs: upper fs does not support tmpfile.
[    3.699946] jffs2: Node totlen on flash (0xffffffff) != totlen from node
ref (0x0000002c)
[    3.708309] jffs2: Node totlen on flash (0xffffffff) != totlen from node
ref (0x00000044)
[    3.716672] overlayfs: upper fs does not support RENAME_WHITEOUT.
[    3.722885] overlayfs: upper fs does not support xattr, falling back to
index=off and metacopy=off.
chroot: can't execute '/bin/sh': No such file or directory

Unable to confirm /sbin/init is an executable non-empty file
in merged file system mounted at /root.

Found a related discussion on
https://lists.ozlabs.org/pipermail/openbmc/2019-April/015925.html,
but the workaround mentioned there - to drop read calibration with
*optimize_read=false
*didn't help.
FYI - Able to boot the same image from tftpboot and qemu.

Has anyone come across similar issue or any suggestions to try out?

Thanks,
Shakeeb
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