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DM368 stuck/hang when accessing NAND flash after dhcp

Tore Fleten
Prodigy 20 points

Some devices get stuck/hang when we access NAND flash after we have run dhcp (in u-boot).

Commands:
UBOOT> dhcp
UBOOT> nand erase clean
<stuck/hang>

We debug and found out it has something with Ethernet RX teardown.

Register commands:
#Teardown RX Ethernet (sequence from dhcp command)
UBOOT> mw.l 01d07018 0
UBOOT> md.l 01d07660 1
01d07660: fffffffc
UBOOT> mw.l 01d07660 fffffffc
UBOOT> mw.l 01d07660 0
# Access EMIF (NAND Flash)
UBOOT> md.b 04000010 1
04000010:
<stuck/hang, no chip select>

  • 0
    Prodigy 20 points
    Hi Tore,

    We are having the same issue, I have found that there are a few people with the same issue but have not found a solution yet...

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/100/t/93682

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/100/p/240361/969398#969398

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/100/t/280955
  • 0 in reply to pierre jou
    Prodigy 20 points
    Solution may be to only run Ethernet RX teardown, when receiver is enabled.
    This worked on two of my Device, which previously always failed.

    diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
    index 4134a96..2400588 100644
    --- a/drivers/net/davinci_emac.c
    +++ b/drivers/net/davinci_emac.c
    @@ -590,8 +590,12 @@ static void davinci_eth_close(struct eth_device *dev)
    {
    debug_emac("+ emac_close\n");

    - davinci_eth_ch_teardown(EMAC_CH_TX); /* TX Channel teardown */
    - davinci_eth_ch_teardown(EMAC_CH_RX); /* RX Channel teardown */
    + /* TX Channel teardown only when enabled */
    + if (readl(&adap_emac->TXCONTROL) & 0x1)
    + davinci_eth_ch_teardown(EMAC_CH_TX);
    + /* RX Channel teardown only when enabled */
    + if (readl(&adap_emac->RXCONTROL) & 0x1)
    + davinci_eth_ch_teardown(EMAC_CH_RX);

    /* Reset EMAC module and disable interrupts in wrapper */
    writel(1, &adap_emac->SOFTRESET);
  • 0 in reply to Tore Fleten
    Prodigy 20 points
    Hi Tore,

    This solutions seems to be working on our boards as well. Thank you.

    Pierre