Difference between revisions of "Microzed issues"
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==List== | ==List== | ||
− | + | ===<b style='color:green'>[CLEARED]</b> UART=== | |
<font size='2'> | <font size='2'> | ||
<b>Description:</b> | <b>Description:</b> | ||
Line 31: | Line 31: | ||
</font> | </font> | ||
− | + | ===<b style='color:green'>[CLEARED]</b> SSH terminal=== | |
<font size='2'> | <font size='2'> | ||
<b>Description:</b> | <b>Description:</b> | ||
Freezes, lags but remembers all typed symbols | Freezes, lags but remembers all typed symbols | ||
<b>Possible reason:</b> | <b>Possible reason:</b> | ||
− | + | Devices with identical MACs in LAN | |
</font> | </font> | ||
− | + | ===RTC=== | |
<font size='2'> | <font size='2'> | ||
− | |||
<b>Description:</b> | <b>Description:</b> | ||
+ | Not an issue | ||
3x"hwclock: can't open '/dev/misc/rtc': No such file or directory" in boot log | 3x"hwclock: can't open '/dev/misc/rtc': No such file or directory" in boot log | ||
<b>Possible reason:</b> | <b>Possible reason:</b> | ||
− | driver | + | a. Microzed doesn't have a real-time clock (rtc) |
+ | b. Reported by /etc/init.d/hwclock.sh - not the driver | ||
</font> | </font> | ||
− | + | ===U-boot Falcon mode (boot from SPL directly to OS avoiding full u-boot)=== | |
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<b>Description:</b> | <b>Description:</b> | ||
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<b>Possible reason:</b> | <b>Possible reason:</b> | ||
− | + | ===U-boot spl reads u-boot-dtb.img 2 times=== | |
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<b>Description:</b> | <b>Description:</b> | ||
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</font> | </font> | ||
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==Useful pages== | ==Useful pages== |
Latest revision as of 15:35, 23 February 2016
Contents
List
[CLEARED] UART
Description: UART register contents: timeout=0 rxfifo_level=56, should be timeout=10 rxfifo_level=56 minicom prints 56 symbols at a time when rxfifo reaches its level. remembers all typed symbols sometimes the timeout register is set correctly Possible reason: In driver .startup and .termios conflict? Racing Resets or reset takes time? Solution: Added a delay after reset - some other functions in the driver also have it - some not. Luck? Patch: diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index f214c7f..164e32d 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -704,6 +704,9 @@ static void cdns_uart_set_termios(struct uart_port *port, ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST; cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + while (cdns_uart_readl(CDNS_UART_CR_OFFSET) & + (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST)) + cpu_relax(); /* * Clear the RX disable and TX disable bits and then set the TX enable * bit and RX enable bit to enable the transmitter and receiver. Links: * https://forums.xilinx.com/t5/Zynq-All-Programmable-SoC/Zynq-Uart-timeout-problem/td-p/432016 * http://www.makelinux.net/ldd3/chp-7-sect-3
[CLEARED] SSH terminal
Description: Freezes, lags but remembers all typed symbols Possible reason: Devices with identical MACs in LAN
RTC
Description: Not an issue 3x"hwclock: can't open '/dev/misc/rtc': No such file or directory" in boot log Possible reason: a. Microzed doesn't have a real-time clock (rtc) b. Reported by /etc/init.d/hwclock.sh - not the driver
U-boot Falcon mode (boot from SPL directly to OS avoiding full u-boot)
Description: Try Possible reason:
U-boot spl reads u-boot-dtb.img 2 times
Description: Not an issue - prints "reading u-boot-dtb.img" 2 times. "Very Annoying","Every microsecond counts"! Possible reason: u-boot/common/spl/spl_fat.c: int spl_load_image_fat(block_dev_desc_t *block_dev, int partition, const char *filename) { int err; struct image_header *header; err = spl_register_fat_device(block_dev, partition); if (err) goto end; header = (struct image_header *)(CONFIG_SYS_TEXT_BASE - sizeof(struct image_header)); err = file_fat_read(filename, header, sizeof(struct image_header)); if (err <= 0) goto end; spl_parse_image_header(header); err = file_fat_read(filename, (u8 *)spl_image.load_addr, 0); end: #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT if (err <= 0) printf("%s: error reading image %s, err - %d\n", __func__, filename, err); #endif return (err <= 0); }
Useful pages
- http://processors.wiki.ti.com/index.php/Enabling_Stack_Dumping_in_Linux_Kernel
- https://lists.yoctoproject.org/pipermail/poky/2015-February/010037.html - change hostname in poky
- http://www.makelinux.net/ldd3/chp-7-sect-3
- http://www.denx.de/wiki/pub/U-Boot/MiniSummitELCE2013/2013-ELCE-U-Boot-Falcon-Boot.pdf