From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bin Meng Date: Tue, 22 Sep 2015 10:06:43 +0800 Subject: [U-Boot] Galileo instructions In-Reply-To: References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Simon, On Tue, Sep 22, 2015 at 3:41 AM, Simon Glass wrote: > Hi Bin, > > On 14 September 2015 at 20:30, Bin Meng wrote: >> >> Hi Simon, >> >> On Tue, Sep 15, 2015 at 10:15 AM, Simon Glass wrote: >> > Hi Bin, >> > >> > On 14 September 2015 at 20:06, Bin Meng wrote: >> >> >> >> Hi Simon, >> >> >> >> On Tue, Sep 15, 2015 at 9:52 AM, Simon Glass wrote: >> >> > Hi Bin, >> >> > >> >> > On 14 September 2015 at 08:32, Bin Meng wrote: >> >> >> Hi Simon, >> >> >> >> >> >> On Mon, Sep 14, 2015 at 9:59 PM, Bin Meng wrote: >> >> >>> Hi Simon, >> >> >>> >> >> >>> On Mon, Sep 14, 2015 at 8:51 PM, Simon Glass wrote: >> >> >>>> Hi Bin, >> >> >>>> >> >> >>>> On 14 September 2015 at 06:49, Bin Meng wrote: >> >> >>>>> >> >> >>>>> Hi Simon, >> >> >>>>> >> >> >>>>> On Mon, Sep 14, 2015 at 8:45 PM, Simon Glass wrote: >> >> >>>>> > Hi Bin, >> >> >>>>> > >> >> >>>>> > On 13 September 2015 at 03:28, Bin Meng wrote: >> >> >>>>> >> Hi Simon, >> >> >>>>> >> >> >> >>>>> >> On Sun, Sep 13, 2015 at 5:06 AM, Simon Glass wrote: >> >> >>>>> >>> Hi Bin, >> >> >>>>> >>> >> >> >>>>> >>> I have a Galileo Gen 2 and am trying to get U-Boot to start on it. The >> >> >>>>> >>> first problem I have is that the schematic says the chip is a W25Q64FV >> >> >>>>> >>> which I think is an 8MB part, but the image produced is only 1MB. >> >> >>>>> >> >> >> >>>>> >> Yes, the board has an 8MB SPI flash, but U-Boot (u-boot.rom) only >> >> >>>>> >> utilizes the last 1MB. >> >> >>>>> >> >> >> >>>>> >>> >> >> >>>>> >>> Also I know that there is a Gen 1 and a Gen 2. I recall you saying >> >> >>>>> >>> that U-Boot supports the Gen 2 but can easily support the Gen 1. But >> >> >>>>> >>> perhaps I have done something wrong. >> >> >>>>> >>> >> >> >>>>> >> >> >> >>>>> >> I've verified U-Boot can boot on both gen1 and gen2 boards. >> >> >>>>> > >> >> >>>>> > Thanks. >> >> >>>>> >> >> >> >>>>> >>> I downloaded the BSP from here: >> >> >>>>> >>> >> >> >>>>> >>> https://downloadcenter.intel.com/download/23197/Intel-Quark-BSP >> >> >>>>> >>> >> >> >>>>> >>> File name: Board_Support_Package_Sources_for_Intel_Quark_v1.1.0.7z >> >> >>>>> >>> Version: 1.1.0 (Latest) >> >> >>>>> >>> >> >> >>>>> >>> Date: 03/03/2015 >> >> >>>>> >>> Size: 2.72 MB >> >> >>>>> >>> >> >> >>>>> >>> Any hints? I am using a dediprog em100 with a test clip over the flash chip. >> >> >>>>> >>> >> >> >>>>> >> >> >> >>>>> >> It's not clear to me what issue you got. It looks like there might be >> >> >>>>> >> some issue for dediporg em100 to handle the rom size mismatch? If this >> >> >>>>> >> is the case, you can just create an 8MB u-boot.rom with the 1MB >> >> >>>>> >> version with other 7MB filled up with 0xFFs. >> >> >>>>> > >> >> >>>>> > OK I did this and it works, thanks. >> >> >>>>> >> >> >>>>> So it's indeed the dediprog em100 cannot handle the rom mismatch? >> >> >>>>> >> >> >>>>> > Why don't we just change the ROM size? This point is not mentioned in README.x86. >> >> >>>>> > >> >> >>>>> >> >> >>>>> 1MB is enough for U-Boot. u-boot.rom does not necessarily have to >> >> >>>>> match the SPI flash size. And on Galileo since there is no Intel ME, >> >> >>>>> so we don't need to create a whole 8MB rom. This is the same as Intel >> >> >>>>> CrownBay, which has a 2MB SPI flash, but still 1MB u-boot.rom. >> >> >>>> >> >> >>>> What is the benefit of this mismatch? I only see the down-side at >> >> >>>> present (user confusion, unbootable .rom). >> >> >>> >> >> >>> I don't see this as a down-side. Why did you call this as unbootable >> >> >>> .rom? The Dediprog em100 does not work does not mean it is not >> >> >>> bootable. The assumption is to program this 1MB u-boot.rom to the last >> >> >>> 1MB of the SPI flash. Perhaps you need contact Dediprog to fix their >> >> >>> em100 tool to handle such rom mismatch correctly. Or maybe there is >> >> >>> some parameter to control such behavior that you are not aware of. I >> >> >> >> >> >> I don't have a dediprog em100 tool, but based on the user manual [1] I >> >> >> found on their website, the em100 tool does support such scenario. If >> >> >> you check page 22, the 'Configuration Setting' window allows you can >> >> >> specify the flash offset at which you download the rom file. The >> >> >> corresponding command line parameter is at page 33, which is '-a >> >> >> addr'. For example, on Galileo board, you need specify '-a 0x700000' >> >> >> (I believe). >> >> > >> >> > Maybe that is the windows version? My version of the utility does not >> >> > have that option. >> >> >> >> Looks it is the Windows version. So you are using Linux version which >> >> does not have such feature? It's quite odd if that's the case. >> >> >> >> > >> >> >> >> >> >>> think this is quite a normal use case, as is exactly the same as other >> >> >>> architectures, that u-boot.bin does not have to match the flash media >> >> >>> size. Say on PowerPC BookE processors, the NOR flash media can be 8MB, >> >> >>> 16MB, but the generated bootable u-boot.bin is 512KB, 1MB, etc (Check >> >> >>> these Freescale QorIQ boards in U-Boot). Users need program u-boot.bin >> >> >>> to the last 512KB or 1MB in the NOR flash. >> >> >>> >> >> >>> And I don't see this is a confusion. Perhaps all x86 boards you've >> >> >>> played before require the Intel ME firmware, in which case your >> >> >>> u-boot.rom MUST match the SPI flash size, but we have to realize Intel >> >> >>> ME is an optional feature and not every x86 board requires that. I am >> >> >>> afraid this is a preconceived idea instead of confusion. >> >> >>> >> >> >> >> >> >> And one more use case from my experience FYI, on Intel Bayley Bay >> >> >> which is a BayTrail based board, and it requires Intel ME, as you see >> >> >> its u-boot.rom is 8MB which is the same as MinnowMax. But I did a >> >> >> trick in my debugging, that I changed the rom size to 1MB and remove >> >> >> the Intel ME Kconfig option from 'menuconfig'. This way I only need >> >> >> program a 1MB u-boot.rom starting from 0x700000. Only the very first >> >> >> time I touch this board, I chose to program the complete 8MB >> >> >> u-boot.rom to the SPI flash. Programming 1MB takes quite less time >> >> >> than 8MB, not to mention the first 5MB (flash descriptors plus Intel >> >> >> ME firmware) is always the same. >> >> > >> >> > OK I see, but in that case you are building a partial image. This is >> >> > an optimisation which could be done another way, e.g. by cutting off >> >> > the top part of the image. >> >> > >> >> >> >> It is not a partial *image*. It is a complete image which can boot on >> >> the board. It is not working because we programmed (ie: using Dediprog >> >> sf100) or downloaded (ie: using Dediprog em100) to a wrong place. We >> >> probably could say it is a partial *rom*, if we specify *rom* >> >> corresponds to the whole SPI flash. >> >> >> >> > I think the .rom file should actually be writen to the ROM as is. To >> >> > me it seems clearer. Perhaps we should provide another file which is >> >> >> >> No, I don't think so. The SPI flash is only the flash media to store >> >> bootloader, but the bootloader file size does not have to match the >> >> SPI flash size. The SPI flash can have some places to store kernel >> >> image, root file system, etc. We cannot create a u-boot.rom which >> >> occupies all these spaces. >> >> >> >> > optimised - e.g. a minimal file like u-boot.rom.min? Also even 1MB is >> >> > a lot more than you normally need to write - does the flashing tool >> >> > you use provide options to write a partial image? >> >> >> >> Again, it is not a partial *image*. It is a complete *image*. The >> >> flash tool (I am using Dediprog sf100) supports writing a file to >> >> whatever flash offset. And I believe, such feature is probably >> >> supported by all flash tools in the market as it is a very basic and >> >> common use case. Why are you forcing users to always erase the whole >> >> SPI flash and program a file which corresponds to the whole SPI flash? >> >> It is not only SPI flash, but also the case for NOR flash, NAND flash >> >> programmers that I have ever used. All of these support writing a file >> >> to a particular flash offset. >> > >> > Well since this seems to be what you want, then at least the docs >> > should be updated to explain this. >> >> I think this is a common sense, isn't it? As I said, perhaps there is >> a preconceived idea on the ROM location. Since preciously all x86 >> board you've worked on happen to require a u-boot.rom corresponding to >> whole SPI flash in order to boot (this is required by the chipset >> implementation, as there is a flash descriptor plus Intel ME firmware >> needs to be there). But SPI flash is not solely used to store >> bootloader, just like the case on ARM and PowerPC targets. > > Sure, but yes I do think it is confusing. > >> >> > >> > Perhaps it is more confusing because the image goes at the end of the >> > ROM, not the start. >> > >> >> Well, it seems to me you've been working too much in the ARM world >> where ARM bootloaders (to be exactly, 1st stage bootloaders) normally >> starts from flash offset 0 because the reset vector is there. :-) This >> is always the case for x86 (at the flash end due to x86 reset vector >> is there), and for PowerPC BookE processors (like IBM/AMCC 4xx, >> Freescale MPC85xx, QorIQ P/T series). Other PowerPC processors like >> 603, 83xx have an option to decide where the bootloader should be (ie: >> they can reside at the start of the flash, just like ARM). I would say >> this is not a confusion, as this is something defined by the >> architecture and/or the SoC implementation that we (as U-Boot users) >> must be aware of. > > Working *not enough* in the ARM world :-) > > I do think it would be useful to update the docs here. The 'ROM size' > parameter seems pretty confusing to me. I suggest a README.x86 update. > OK, sounds good to me. Regards, Bin