RE: [PATCH] usb: fsl_udc: errata - postpone freeing current dTD
flat view
From: Chen Peter-B29397 <hidden>
Date: 2012-05-21 01:05:33
=20
=20 USB controller may access a wrong address for the dTD (endpoint transfer descriptor) and then hang. This happens a lot when doing tests with g_ether module and iperf, a tool for measuring maximum TCP and UDP bandwidth. =20 This hardware bug is explained in detail by errata number 2858 for i.MX23=
:
http://cache.freescale.com/files/dsp/doc/errata/IMX23CE.pdf =20
Does this patch fix your problem? =20
quoted hunk ↗ jump to hunk
+#if defined CONFIG_ARCH_MX51 || defined CONFIG_SOC_IMX35 +#define POSTPONE_FREE_LAST_DTD +#else +#undef POSTPONE_FREE_LAST_DTD +#endif +
All i.mx SoC has this problem, if PowerPC also has this problem, you can=20 delete #if defined. Else, you can define it for all i.mx SoC=20 (CONFIG_ARCH_MXC | CONFIG_ARCH_MXS)
/* ### define USB registers here */ #define USB_MAX_CTRL_PAYLOAD 64 -- 1.7.2.5 =20 =20