Prafulla Wadaskar wrote: > Dear Remy Bohmer > > I am going to start "boot from USB Support" development for kirkwood. what this "boot from USB Support" means?
I know "boot from nand", and I know that the Ingenic CPU, support "boot from USB". is the same meaning? here is part of JZ4740 cpu data sheet [1] -- 3.7.3 BOOT Jz4740 support 3 different boot sources depending on BOOT_SEL0 and BOOT_SEL1 pin values. Table 3-29 lists them. Table 3-29 Boot from 3 boot sources BOOT_SEL1 BOOT_SEL0 Boot Source 0 0 Boot from NOR flash at CS4 0 1 Boot from USB device 1 0 Boot from 512 page NAND flash at CS1 1 1 Boot from 2k page NAND flash at CS1 -- [1] ftp://ftp.ingenic.cn/2soc/Jz4740_ds.pdf > To sync with current USB framework in U-boot, and to reduce some rework at my > side (since I am new to this driver). > May you please provide some guidelines/howto this regard? > > FYI below is details about Kirkwood USB controller: > > Kirkwood contains a Universal Serial Bus (USB 2.0) port that includes an > embedded USB 2.0 PHY. > The USB 2.0 interface contains a single dual-role controller that can act as > a host or a peripheral > controller (USB controller). A bridge connects the controller to the internal > Mbus interface (USB > bridge). > Embedded USB 2.0 PHY features include: > ?? 480 Mbps High Speed (HS)/ 12 Mbps Full Speed (FS) and 1.5 Mbps Low Speed > (LS) serial data > transmission rates > ?? Synchronization/End-of-Packet (SYNC/EOP) generation and checking > ?? Data and clock recovery from serial stream on the USB > ?? Non Return to Zero Invert (NRZI) encoding/decoding with bit > stuffing/unstuffing > ?? Bit stuff error detections > ?? Bit stuffing/unstuffing; bit stuff error detection > ?? Holding registers to stage transmit and receive data > ?? Supports USB 2.0 Test Modes > ?? Ability to switch between FS and HS terminations/signaling > ?? For more details, refer to the controller specification document USB-HS > High-Speed > Controller Core Reference. > > Regards.. > Prafulla . . > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot -- Best Regards Xiangfu Liu jabber : xiangf...@gmail.com skype : xiangfu.z _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot