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TinkerBoard / debian_kernel

Debian Kernel source for Tinker Board
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SPI transfer size >32 bytes corrupts memory and will likely hang the system #51

Open dhendrix opened 4 years ago

dhendrix commented 4 years ago

When transferring >32 bytes on SPI0 or SPI2, it seems to clobber memory and will likely crash the system. I noticed this when trying to use the SPI buses to read a flash chip using transfer size == 4096 bytes as per /sys/module/spidev/parameters/bufsiz. Using 32 bytes instead seems to work fine.

I am using the current TinkerOS image, Tinker_Board-Debian-Stretch-V2.1.11-20200310.img.

Using Linux's spidev_test tool (under linux/tools/spi), we can easily reproduce this behavior. Examples:

  1. Transfer 32 bytes - We see the correct bytes on TX (16 a's followed by 16 b's in this example), and all 0xff's on RX as expected linaro@tb1:~/src/linux/tools/spi$ sudo ./spidev_test -v -D /dev/spidev0.0 -s 1000000 -i /tmp/in_32b.bin -o /tmp/out_32b.bin spi mode: 0x0 bits per word: 8 max speed: 1000000 Hz (1000 KHz) TX | 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 | aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbb RX | FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF | ................................

  2. Transfer 64 bytes - We see the correct bytes on TX (16 a's followed by 16 b's, 16 c's, and 16 d's). However, RX shows corruption immediately. linaro@tb1:~/src/linux/tools/spi$ sudo ./spidev_test -v -D /dev/spidev0.0 -s 1000000 -i /tmp/in_64b.bin -o /tmp/out_64b.bin spi mode: 0x0 bits per word: 8 max speed: 1000000 Hz (1000 KHz) TX | 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 | aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbb TX | 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 | ccccccccccccccccdddddddddddddddd RX | FF 00 00 00 C6 88 DE BE 00 00 00 00 00 00 00 00 2F 74 6D 70 2F 72 61 6E 64 6F 6D 5F 36 34 62 5F | ....ƈ޾......../tmp/random64b RX | 6F 75 74 2E 62 69 6E 00 2F 6C 69 62 63 2E 73 6F 2E 36 00 00 2E 62 69 6E 00 6E 69 74 6F 72 65 2D | out.bin./libc.so.6...bin.nitore-

ivbsd1 commented 4 years ago

Hi, I have the same problem with Tinker Board running Debian: Linux tinkerboard 4.4.132+ #1 SMP Wed Aug 21 19:15:55 CST 2019 armv7l GNU/Linux

Are there some updates about this SPI problem ? When fix expected ? Maybe someone can suggest workaround ? Thanks

dcarlson27 commented 2 years ago

I just ran in to this. Can anyone share possible fix, or when spidev was updated to address this?

yishinhung commented 2 years ago

Hi @dcarlson27 : Which image version do you use? I use the following image version and verify normally.