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2020-04-27mips: mtmips: rewrite lowlevel codes of mt7628Weijie Gao17-795/+1201
This patch rewrites the mtmips architecture with the following changes: 1. Move MT7628 soc parts into a subfolder. 2. Lock parts of D-Cache as temporary stack. 3. Reimplement DDR initialization in C language. 4. Reimplement DDR calibration in a clear logic. 5. Add full support for auto size detection for DDR1 and DDR2. 6. Use accurate CPU clock depending on the input xtal frequency for timer and delay functions. Note: print_cpuinfo() has incompatible parts with MT7620 so it's moved into mt7628 subfolder. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: add a option to support not reserving malloc space on initial stackWeijie Gao2-2/+22
The initial stack on some platforms is too small to hold a large malloc space. This patch adds a option to allow these platforms not reserving the malloc space on initial stack. These platforms should set the malloc base after DRAM is usable. Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: add an option to support initialize SRAM for initial stackWeijie Gao2-0/+16
Currently CONFIG_MIPS_INIT_STACK_IN_SRAM assumes the memory space for the initial stack can be used directly. However on some platform the SRAM needs initialization, e.g. lock cache. This patch adds an option to allow a new function mips_sram_init() being called before setup_stack_gd. Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27spl: spl_legacy: Add lzma decompression support for legacy imageWeijie Gao1-2/+60
This patch adds support for decompressing LZMA compressed u-boot payload in legacy uImage format. Using this patch together with u-boot-lzma.img may be useful for some platforms as they can reduce the size and load time of u-boot payload. Signed-off-by: Weijie Gao <weijie.gao@mediatek.com> Signed-off-by: Stefan Roese <sr@denx.de> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-04-27spl: spl_nor: Remove unused variable 'ret' warningStefan Roese1-6/+6
With the if statement now for the legacy image handling, the compiler now generates this compile time warning: common/spl/spl_nor.c:27:6: warning: unused variable 'ret' [-Wunused-variable] This patch removes this warning by changing the 'ret' variable handling. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-04-27spl: spl_nor: Move legacy image loading into spl_legacy.cStefan Roese3-8/+40
Move the legacy image loading into spl_legacy.c. This makes it easier to extend the legacy image handling with new features that other SPL loaders might use (e.g. spl_spi.c etc). No functional change intended. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-04-27spl: spl_legacy: Use IS_ENABLED() to remove #ifdefStefan Roese1-3/+2
Use IS_ENABLED() instead of #ifdef CONFIG_ to remove one #ifdef. No functional change intended. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-04-27spl: Extract legacy image handling into separate fileStefan Roese3-44/+67
This patch moves the legacy image handling into a separate file, which will be extended with other legacy image features later. No function change intended. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-04-27Makefile: add support to generate LZMA compressed u-boot imageWeijie Gao1-0/+13
This patch adds support for generating LZMA compressed u-boot image. The compressed image can be used for SPL to reduce the size of the u-boot binary. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27lib: enable lzma decompression support for SPL buildWeijie Gao2-0/+6
This patch enables LZMA decompression support for SPL build Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27dts: mtmips: add alternative pinmux node for uart2Weijie Gao1-0/+5
This patch adds a new pinmux for UART2, which shares the pins with SPIS. Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: add a mtmips-specific field to architecture-specific global dataWeijie Gao1-0/+3
SoCs of mtmips can use different CPU frequencies depending on the HW/SW configurations. For example mt7628 uses 580MHz clock if the input xtal frequency is 40MHz, and 575MHz clock if the xtal is 25MHz. Upon cold boot the CPU uses the xtal frequency directly. So hardcoding the timer frequency (half of the CPU frequency) in CONFIG_SYS_MIPS_TIMER_FREQ is not a good idea for this case. This patch adds a mtmips-specific field timer_freq to arch_global_data. This field will be used later in mtmips-specific get_tbclk() to provide accurate timer frequency in different boot stage. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: mtmips: make use of sysreset-resetctrl for mt7628 socWeijie Gao6-9/+6
This patch replaces sysreset-syscon with sysreset-resetctrl for mt7628 soc. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27sysreset: add reset controller based reboot driverWeijie Gao3-0/+55
Some chips provide their sysreset function in reset controller, which is normally a bit written to 1 to perform the sysreset. This patch adds a new sysreset driver to take advantage of it. Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: spl: Flush cache before jumping to U-Boot properStefan Roese2-0/+22
This patch adds a MIPS specific jump_to_image_no_args() implementation, which flushes the U-Boot proper image loaded from the boot device in SPL before jumping to it. It has been noticed on MT76x8, that this cache flush is needed. Other MIPS platforms might need it as well. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-04-27mips: add an option to enable u_boot_list section for SPL loaders in ↵Weijie Gao2-1/+7
u-boot-spl.lds u_boot_list is not only used by DM, but also by some SPL image load methods such as spl_nor.c. This patch adds an option CONFIG_SPL_LOADER_SUPPORT in conjunction with CONFIG_SPL_DM surrounding the u_boot_list section to make sure SPL image loaders can be correctly built into u-boot SPL without DM enabled. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: enable support for appending dtb to spl binaryWeijie Gao1-0/+2
If CONFIG_SPL_OF_CONTROL is enabled for SPL and CONFIG_OF_SEPARATE is also enabled, the dtb will be appended to the u-boot-spl.bin. When calling dm_init_and_scan() in SPL, fdtdec_setup() will try to locate dtb at the end of u-boot-spl.bin, by referencing to _image_binary_end. However _image_binary_end is currently missing in u-boot-spl.lds. This patch adds _image_binary_end to u-boot-spl.lds to make sure linking u-boot-spl will not fail. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: start.S: avoid overwriting outside gd when clearing global data in stackWeijie Gao1-1/+2
When setting up initial stack, global data will also be put in the stack, and being cleared. The assembler instructions for clearing gd is as follows: move t0, k0 1: PTR_S zero, 0(t0) blt t0, t1, 1b PTR_ADDIU t0, PTRSIZE t0 is the start address of gd, t1 is the end address of gd (t0 + GD_SIZE). [PTR_ADDIU t0, PTRSIZE] is in the delay slot of [blt t0, t1, 1b], so it will be executed before the branch operation. However the comparison for the BLT instruction is done before executing the delay slot. This means when the last word just before k1 is cleared, the loop will continue to run once. This will clear an extra word at k1, which is outside the global data. Global data is placed at the top of the stack. If the initial stack is a SRAM or locked cache, the area outside them may be inaccessible. A write operation performed in this area may cause an exception. To solve this, [PTR_ADDIU t0, PTRSIZE] should be placed before the BLT instruction. Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: mtmips: add predefined i-cache/d-cache size and linesizeWeijie Gao1-0/+12
Both mt7620 and mt7628 has the same cache configuration. There is no need to use CONFIG_SYS_CACHE_SIZE_AUTO to probe it at runtime. Add them into Kconfig to reduce some code size. Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27configs: enable CONFIG_RESTORE_EXCEPTION_VECTOR_BASE for all mtmips boardsWeijie Gao4-0/+4
This patch enables CONFIG_RESTORE_EXCEPTION_VECTOR_BASE for all mtmips boards. Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27mips: add support to restore exception vector base before booting linuxWeijie Gao4-0/+54
In U-Boot the exception vector base will be moved to top of memory, to be used to display register dump when exception occurs. But some old linux kernel does not honor the base set in CP0_EBASE. A modified exception vector base will cause kernel crash. This patch adds an option to enable reset exception vector base to its previous value, or a user configured value before booting linux kernel. Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2020-04-27bmips: allow disabling usb supportÁlvaro Fernández Rojas7-0/+14
Currently, if usb is disabled the following error is produced: CC drivers/usb/host/ohci-hcd.o drivers/usb/host/ohci-hcd.c: In function ‘usb_lowlevel_init’: drivers/usb/host/ohci-hcd.c:2057:35: error: ‘CONFIG_SYS_USB_OHCI_REGS_BASE’ undeclared (first use in this function); did you mean ‘CONFIG_SYS_MONITOR_BASE’? gohci.regs = (struct ohci_regs *)CONFIG_SYS_USB_OHCI_REGS_BASE; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CONFIG_SYS_MONITOR_BASE drivers/usb/host/ohci-hcd.c:2057:35: note: each undeclared identifier is reported only once for each function it appears in drivers/usb/host/ohci-hcd.c:2061:20: error: ‘CONFIG_SYS_USB_OHCI_SLOT_NAME’ undeclared (first use in this function); did you mean ‘CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS’? gohci.slot_name = CONFIG_SYS_USB_OHCI_SLOT_NAME; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2020-04-27nand: brcmnand: return without disabling clockÁlvaro Fernández Rojas1-1/+8
Linux Broadcom NAND driver only disabled clock if no childs are initialized. This section of the code seems to have been accidentally dropped when it was imported in U-Boot. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-04-27Merge tag 'video-for-v2020.07-rc1' of ↵Tom Rini3-1/+4
https://gitlab.denx.de/u-boot/custodians/u-boot-video - simple panel 'nv140fhmn49' compatible - rockchip eDP and LVDS drivers build fix
2020-04-27ARC: AXS10x: cleanup kconfigEugeniy Paltsev1-2/+0
As we've dropped NAND support for AXS101 and AXS103 see commit 4f5e552d95bb ("ARC: AXS10x: drop NAND support") we don't need bounce buffer anymore. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: make init status resistant to U-boot reloadingEugeniy Paltsev1-3/+25
Use register intstead of static variable to store HSDK init status as we want to avoid the situation when we reload U-boot via MDB after previous init is done but HW reset (board reset) isn't done. So let's store the init status in unused register - CREG_CPU_0_ENTRY so status will survive after U-boot is reloaded via MDB. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: use separate config fileEugeniy Paltsev3-1/+124
HSDK-4xD has quite different environment so let's split HSDK and HSDK-4xD configs file. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: tweak memory mapEugeniy Paltsev1-0/+58
For HSDK-4xD we do additional AXI bridge tweaking while doing hsdk_init command: - we shrink IOC region. - we configure ARC HS CORE SLV1 aperture depending on haps_apb_location environment variable. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: add CSM configuration supportEugeniy Paltsev2-0/+30
Add support for CSM enable/disable and CSM relocation via hsdk_init command. We allow to relocate CSM to the beginning of any aperture even if HW support finer granularity. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: add support for SLC enable/disableEugeniy Paltsev1-0/+22
Add support for SLC enable/disable via hsdk_init command. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: print timer clock valueEugeniy Paltsev2-2/+6
Print timer clock value in hsdk_clock print_all command. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: drop additional GPU clock infoEugeniy Paltsev1-2/+4
HSDK-4xD has other GPU type so it consumes only GPU core clock. Even we have additional GPU clock dividers they are not routed to anything. So drop information about those additional clocks in hsdk_clock print_all command. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: print info about HDMI clocksEugeniy Paltsev1-4/+7
HSDK-4xD has HDMI working so let's print info about HDMI clocks. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: fix headerize script for HSDK-4xD compatibilityEugeniy Paltsev2-3/+11
ARC HS CPU in HSDK-4xD has ARC ID = 0x54, so fix headerize script accordingly. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: use active low polarity of cpu_start pulseEugeniy Paltsev1-7/+19
Add quirk for HSDK-4xD - due to HW issues HSDK can use any pulse polarity but HSDK-4xD require active low polarity of cpu_start pulse. So use low polarity of cpu_start pulse for both board. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK: split HSDK and HSDK-4xD DTSEugeniy Paltsev5-144/+167
Split HSDK and HSDK-4xD device tree files so they can have different model names. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK-4xD: add initial board supportEugeniy Paltsev6-4/+164
Add initial HSDK-4xD board support. The ARC HS4x/HS4xD Development Kit includes a multicore ARC HS4xD-based chip that integrates a wide range of interfaces including Ethernet, HDMI, WiFi, Bluetooth, USB, SDIO, I2C, SPI, UART, I2S, ADC, PWM and GPIO, as well as a Think Silicon GPU. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: HSDK: CGU: add support for timer clockEugeniy Paltsev2-5/+9
Add support for additional timer clock which belongs to tunnel domain. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27ARC: ARCv2: handle DSP presence in HWEugeniy Paltsev2-0/+16
In case of DSP extension presence in HW some instructions (related to integer multiply, multiply-accumulate, and divide operation) executes on this DSP execution unit. So their execution will depend on dsp configuration register (DSP_CTRL) As we want these instructions to execute the same way regardless of DSP presence we need to set DSP_CTRL properly. NOTE: we do the same adjustments in Linux kernel, see in kernel tree: commit 4827d0cf744e ("ARC: handle DSP presence in HW") Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
2020-04-27arm: socfpga: stratix10: Fix incorrect CLKMGR_S10_PERPLL_BYPASS offsetLey Foon Tan1-1/+1
Offset value for CLKMGR_S10_PERPLL_BYPASS should be 0xb0, fix it. Reported-by: Chee Hong Ang <chee.hong.ang@intel.com> Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-04-27configs: socfpga: arria10: Enable USB supportLey Foon Tan1-0/+4
Enable configs to support USB in Arria 10. CONFIG_CMD_USB=y CONFIG_USB=y CONFIG_DM_USB=y CONFIG_USB_DWC2=y Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-04-27video: simple_panel: add boe,nv140fhmn49 displayPeter Robinson1-0/+1
add "boe,nv140fhmn49" display to compatible node. Signed-off-by: Peter Robinson <pbrobinson@gmail.com> Cc: Anatolij Gustschin <agust@denx.de>
2020-04-26drivers: video: rockchip: fix building eDP and LVDS driversPeter Robinson2-1/+3
The rk_edp.c and rk_lvds.c files reference rk_setreg which is declared in hardware.h so include it so the drivers build. Adjust rk_lvds.c so includes are in alphabetical order while updating. Signed-off-by: Peter Robinson <pbrobinson@gmail.com> Reviewed-by: Anatolij Gustschin <agust@denx.de> Tested-by: Vagrant Cascadian <vagrant@debian.org>
2020-04-26log: remove useless castHeinrich Schuchardt1-1/+1
There is no need to cast from (void *) before assigning to a pointer. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2020-04-26patman: Tidy up sys.path changesSimon Glass9-14/+7
Now that we are using absolute paths we can remove some of the sys.path mangling that appears in the tools. We only need to add the path to 'tools/' so that everything can find modules relative to that directory. The special paths for finding pylibfdt remain. Signed-off-by: Simon Glass <sjg@chromium.org>
2020-04-26patman: Move to absolute importsSimon Glass58-149/+154
At present patman sets the python path on startup so that it can access the libraries it needs. If we convert to use absolute imports this is not necessary. Move patman to use absolute imports. This requires changes in tools which use the patman libraries (which is most of them). Signed-off-by: Simon Glass <sjg@chromium.org>
2020-04-26binman: Move to absolute importsSimon Glass70-213/+198
At present binman sets the python path on startup so that it can access the libraries it needs. If we convert to use absolute imports this is not necessary. Move binman to use absolute imports. This enables removable of the path adjusting in Entry also. Signed-off-by: Simon Glass <sjg@chromium.org>
2020-04-26buildman: Move to absolute importsSimon Glass7-33/+34
At present buildman sets the python path on startup so that it can access the libraries it needs. If we convert to use absolute imports this is not necessary. Move buildman to use absolute imports. Also adjust moveconfig.py too since it uses some buildman modules and cannot work without this. Signed-off-by: Simon Glass <sjg@chromium.org>
2020-04-26patman: Move test running/reporting to test_utilSimon Glass2-70/+108
This code is useful in other tools. Move it into a common file so it can be shared. Signed-off-by: Simon Glass <sjg@chromium.org>
2020-04-26patman: Drop the python2 code in test coverageSimon Glass1-7/+8
We don't need to run test coverage with Python 2 now. Drop the special-case code. Signed-off-by: Simon Glass <sjg@chromium.org>